Average Speed
1. In the 2008 Summer Olympics, Usain Bolt won the 100-m race in 9.69 s. What was his average speed?
2. Light from the sun reaches Earth in 8.3 min. The speed of light is 3.0108 m/s. How far is Earth from the sun?
3. In Major League Baseball, the distance between the pitcher’s mound and home plate is 18.5 m. On September 24, 2010, Aroldis Champman threw a 105-mph fastball. How much time (in s) does the take to get to homeplate?
4. A high school athlete runs 100 m in 12.2 s. What is the athlete’s average speed?
5. Suppose a car travels at a constant speed of 25 mph. How far would it move in (a) 1 hour (b) 1 minute (c) 1 second?
6. To establish the world record for the fastest jet-engined car, the car must travel a distance of 604 m in one direction then travel the same distance in the opposite direction. The first run took 2.12 s and the second run took 2.15 s. (a) What was the average speed for the first run? (b) What was the average speed for the second run?
7. You are driving down a street at 35 mph. Suddenly a child runs into the street in front of you. It takes you 0.75 s to react and slam on the brakes. How many meters do you travel before you begin to slow down?
8. If you drive at 55 mph, how long will it take you to travel from Norfolk to Nags Head N.C., 81.6 miles?
9. If a migrating bird can average 25 mph, how far can this bird travel in 3 weeks? Assume that the bird flies 12 hours per day.
10. A football player runs with an average speed of 9.52 m/s. How much time does it take him to cover 40 yards?
11. If a plane can travel at a speed of 270 mph, how much time will it take to go 852 miles?
12. On the interstate, you pass the 5-mile marker at 9:00 am. At 9:30 am, you pass the 32-mile marker. What is your average speed?
13. In a particle accelerator, an electron can travel at 90% of the speed of light. How far can an electron travel in the blink of eye, 0.9 s?
14. You walk four and a half times around a circular track in 1 hour. The radius of the track is 200 meters. What was your average speed (in m/s)?
Ray... again, nobody will do your work for you.
I suggest using forumlas to solve the problems..
Post what you think the answers are, and I will try to expand to help you understand.
23 seconds
To calculate average speed, you need to divide the total distance traveled by the total time taken. Here's how you can find the answers to each of the questions:
1. To find Usain Bolt's average speed in the 100-m race, divide the distance (100 m) by the time taken (9.69 s).
Average Speed = Distance / Time
2. To calculate the distance between Earth and the sun, multiply the speed of light (3.0108 m/s) by the time taken (8.3 min). Remember to convert the time to seconds (1 min = 60 s).
Distance = Speed * Time
3. To find the time it takes for Aroldis Champman's fastball to reach homeplate, divide the distance (105 mph) by the speed in meters per second (m/s). Convert miles per hour to meters per second (1 mph = 0.44704 m/s).
Time = Distance / Speed
4. To determine the athlete's average speed in running 100 m, divide the distance (100 m) by the time taken (12.2 s).
Average Speed = Distance / Time
5. For the car traveling at a constant speed of 25 mph:
(a) To find the distance covered in 1 hour, multiply the speed (25 mph) by the time (1 hour). Convert miles to meters if required.
(b) To calculate the distance covered in 1 minute, divide the distance covered in an hour by 60.
(c) To determine the distance covered in 1 second, divide the distance covered in a minute by 60.
6. (a) To find the average speed for the first run, divide the distance (604 m) by the time taken (2.12 s).
(b) To calculate the average speed for the second run, divide the distance (604 m) by the time taken (2.15 s).
7. To determine the distance traveled before braking, multiply the speed (35 mph) by the reaction time (0.75 s). Convert miles to meters if needed.
Distance = Speed * Time
8. To calculate the time taken to travel a certain distance, divide the distance (81.6 miles) by the speed (55 mph). Convert miles to hours if needed.
Time = Distance / Speed
9. To determine how far a bird can travel in 3 weeks, first calculate the total flying time in hours by multiplying the number of weeks (3 weeks) by the number of flying hours per day (12 hours per day). Then, multiply the flying time by the bird's average speed (25 mph) to get the total distance traveled. Convert miles to the desired unit if necessary.
Distance = Speed * Time
10. To calculate the time taken to cover 40 yards, divide the distance (40 yards) by the speed (9.52 m/s). Remember to convert yards to meters if needed.
Time = Distance / Speed
11. To find the time taken to travel a certain distance, divide the distance (852 miles) by the speed (270 mph). Convert miles to hours if required.
Time = Distance / Speed
12. To calculate your average speed between two mile markers, subtract the initial mile marker (5 miles) from the final mile marker (32 miles). Then, divide the distance by the time taken (30 minutes or 0.5 hours).
Average Speed = Distance / Time
13. To determine how far an electron can travel in 0.9 seconds, multiply the speed of light (3.0108 m/s) by the time taken (0.9 s).
Distance = Speed * Time
14. To find your average speed for walking around the circular track, divide the total distance (4.5 times around the track) by the total time taken (1 hour).
Average Speed = Distance / Time
Remember to convert units if necessary for calculations.