PHYSICS · Multi-part · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
A car is travelling along a straight road at 20m/s. It first accelerates uniformly at 2m/s2 for 5s and then immediately decelerates uniformly at 4m/s2 until its speed is reduced to 10m/s. Answer the following:
(i) Sketch a velocity–time graph representing the complete motion.
(ii) Calculate the total displacement covered during the entire motion described.
(iii) Find the average acceleration for the whole period from the start of acceleration to the end of deceleration.