physics

A car travels on a straight road for 40km at 30km/h. It then continues in same direction for 40km at 60km/h.

a)What is the average velocity of the car during the 80km trip?(assume it moves in positive x direction)

b)What is the average speed?

c)graph and indicate how average velocity is fond on graph

a) I am confused when the car then changes its speed.
b)I forgot the equation for speed
c)Would I graph a position time graph and find out the area under the graph?


The confusion is this: Always, average speed is defined as

distance/time

distance= 40 km + 40 km

time= distance/vel= 40/30 + 40/60

avg speed= 80/(40/30 + 40/60)
in the case of going the same direction, avg speed = avg velocity

On the position time graph...
slope is veloicty. You know the veloicty for the first time of (40/30 hr), plot that line to that time. Then to the second line, starting at the end of the first.

You don't need area. For avg velocity, draw a line from the origin to the ned of the second line, and take the slope of that line....avg velocity= finalpositioin/time

  1. 👍
  2. 👎
  3. 👁
  1. 45

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics

    A car of mass 1200 kg is traveling at 55.0 km/hour. It enters a banked turn covered in ice. The road is banked at 20.0 degrees and there is no friction between the road and the cars tires. Use g= 9.80 m/s throughout the problem

  2. Physics

    The speed limit in a school zone is 40km/h. A driver traveling at this speed sees a child run into the road 13m ahead of his car. He applies the breaks, and the car decelerates at uniform rate of 0.8m/s². If the driver's reaction

  3. physics

    A speeding motorist travels with a constant speed of 15 m/s on a straight road. At time t = 0, he passes a hidden police car which is at rest. The instant that the motorist passes, the police car begins accelerating at a constant

  4. physics

    A car of mass M = 800kg traveling at 40.0km/hour enters a banked turn covered with ice. The road is banked at an angle θ, and there is no friction between the road and the car's tires. (Figure 1) . Use g = 9.80m/s2 throughout

  1. Math

    A car travels along a straight road, heading east for 1 h, then traveling for 30 min on another road that leads northeast. If the car has maintained a constant speed of 48 mi/h, how far is it from its starting position? Round your

  2. physics

    Cars A and B are racing each other along a straight path in following manner: Car A has head start and is a distance dA beyond starting line at t=0. The starting line is at x=o. Car A travels at constant speed vA. Car B starts at

  3. physics, dynamics

    Car A starts from rest at t = 0 and travels along a straight road with a constant acceleration of 2 m/s2 until it reaches a speed of 27 m/s. Afterwards it maintains this speed. Also, when t = 0, car B located 2000 m down the road

  4. Physics

    A car of mass = 1200 traveling at 60.0 enters a banked turn covered with ice. The road is banked at an angle , and there is no friction between the road and the car's tires.What is the radius of the turn if = 20.0 (assuming the

  1. Physics

    An old car is traveling down a long, straight, dry road at 25.0 m/s when the driver slams on the brakes, locking the wheels. The car comes to a complete stop after sliding 305 m in a straight line. If the car has a mass of 755 kg,

  2. physics

    you are driving a 2520.0-kg car at a constant speed of 14.0 m/s along a wet, but straight, level road. As you approach an intersection, the traffic light turns red. You slam on the brakes. The car's wheels lock, the tires begin

  3. Calculus 1

    A police car is located 60ft to the side of a straight road. A red car is driving in the direction of the police car and is 90 ft up the road from the location of the police car. The police radar read that the distance between the

  4. Physics

    A car is stopped at a traffic light. It then travels along a straight road so that its distance from the light is given by x(t) = bt2 - ct3, where b = 2.60 m/s2 and c = 0.150 m/s3. (a) Calculate the average velocity of the car for

You can view more similar questions or ask a new question.