PHYSICS PROBLEM 1) A car is travelling with constant acceleration along a straig

Question

PHYSICS PROBLEM

1) A car is travelling with constant acceleration along a straight tract. You measure the speed of the car to be 3.3 m/s and then you wait 2 s and measure the speed again, but this time the speed is 2.5 m/s. What is the acceleration of the car between your two measurements?

2) A car is travelling with constant acceleration along a straight tract. You measure the speed of the car to be 3.3 m/s and then you wait and measure the speed again 2 m down the track, but this time the speed is 2.5 m/s. What is the acceleration of the car between your two measurements?

3) Could it be that questions 1 and 2 are describing the same two measurements of just one car? Explain.

Explanation / Answer

1. a= vf-vi/t = (2.5-3.3)/2 = -0.4 m/s^2

2. vf^2 = vi^2 +2ad

2.5^2 = 3.3^2 +2*a*2    => a= -1.16 m/s^2

3 No there are different.

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