1.2 Motion (3)

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1.

A speed-time graph for a car is provided below.

Speed-Time Graph

(b) Using the speed-time graph, determine whether the car is moving with constant speed, accelerating, or decelerating. Explain your answer.

2.

An object is dropped from the top of a building. Assuming air resistance is negligible, state, with a reason, why the object’s velocity increases at a constant rate as it falls.

3.

A car accelerates from rest to a speed of 20 m/s in 5 seconds. Calculate the acceleration of the car. Show your working.