Physics for life science
posted by Simeon .
1. A car starts from rest and accelerates at a constant rate to 80km/h in 6s in positive direction. What is the acceleration?
2. After how long will the car speed be 120km/h if it keep accelerating at the same rate as in 1.?
3.After the car reached speed of 120km/h it travels at constant velocity for next 100. What distance does it cover in that 100s?

1. 80 km/h = 22.22 m/s
Divide that by 6s for the acceleration
a = 3.70 m/s^2
2. If the speed reaches 80 km/h in 6 s and the acceleration stays the same, it will reach 120 km/h in 1.5 x 6 = 9 seconds.
3. 120 km/h = 33.33 m/s
Multiply that by 100s for the answer, in meters.
Or, you can multiply 120 km/h by 100/3600 hours, for the distance in km.
Respond to this Question
Similar Questions

Physics
A car starts from rest and accelerates at a constant rate of 1.1 m/s2. If the radius of the car wheels is 29 cm, and the final angular speed of the car wheel is 48 rad/s, how far does the car travel 
Physics
1. A car starts from rest and accelerates uniformly at 3.0 m/s2. A second car starts from rest 6.0 s later at the same point and accelerates uniformly at 5.0 m/s2. How long does it take the second car to overtake the first car? 
physics with 6 questions
Two cars start from rest at a red stop light. When the light turns green, both cars accelerate forward. The blue car accelerates uniformly at a rate of 3.3 m/s2 for 3.9 seconds. It then continues at a constant speed for 13.7 seconds, … 
Physics
Two cars start from rest at a red stop light. When the light turns green, both cars accelerate forward. The blue car accelerates uniformly at a rate of 3.6 m/s2 for 4.5 seconds. It then continues at a constant speed for 7.3 seconds, … 
physics
Two cars start from rest at a red stop light. When the light turns green, both cars accelerate forward. The blue car accelerates uniformly at a rate of 5.5 m/s2 for 4.9 seconds. It then continues at a constant speed for 6.7 seconds, … 
engineering mechanics
A police officer observes a motorist who is approaching at a uniform speed of 80km/h he in his patrol car starts chasing it as it just crosses him.after accelerating for 8 seconds at a constant rate he attains his top speed of 120km/h … 
Physics
Consider two toy cars. Car A starts from rest and speeds up with constant acceleration for a time delta t until it reached a speed of v and then continues to travel at this speed. At the moment car A reaches its maximum speed, car … 
Physics
Consider two toy cars. Car A starts from rest and speeds up with constant acceleration for a time delta t until it reached a speed of v and then continues to travel at this speed. At the moment car A reaches its maximum speed, car … 
physics
Car a starts from rest and speeds up with constant accelleration until it reaches its max speed. Car b starts from rest, at the moment car a is at max speed, and speeds up with constant acceleration. How much time elapses between when … 
Physics
Car A is 12 m ahead of car B on a straight stretch of road. Car A starts from rest and accelerates away from B at 4.0 m/s2. Two seconds later B starts from rest and accelerates after A at 6.0 m/s2. How long will it take B to catch …