A scooter rider notes the reading of a speedometer while travelling along a straight road
PHYSICS · Subjective · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
A scooter rider notes the reading of a speedometer while travelling along a straight road. For the first 6 seconds the speed increases steadily from 10 km h−1 to 25 km h−1. During the next 4 seconds the speed rises from 25 km h−1 to 37 km h−1, but the increase in each second is not the same.
(i) Explain, with reasons, whether the motion in the first 6 s is under uniform or non-uniform acceleration.
(ii) Explain, with reasons, whether the motion in the next 4 s is under uniform or non-uniform acceleration.
(iii) Would it be correct to treat the entire 10 s interval as motion with a single constant acceleration while applying the equations of motion? Give a reason for your answer.