PHYSICS · Multi-part · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
A car starts from rest, moves along a straight road and follows the schedule given below:
• It accelerates uniformly for 5s.
• It then travels with the speed reached for the next 10s.
• Finally it comes to rest with uniform retardation in 5s.
The magnitude of acceleration during the first stage is 2ms−2. Answer the following:
(i) Draw a neat velocity–time graph for the entire motion, marking all important values on both axes.
(ii) Calculate the maximum speed attained by the car.
(iii) Determine the displacement covered in each of the three stages separately.
(iv) Find the total distance travelled and the average speed for the whole journey.