PHYSICS · Multi-part · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
A 1.5×103kg car is initially at rest on a flat, dry road. The engine delivers a constant forward force of 4.0×103N for the first 4.0s. Neglect air resistance and rolling friction.
(a) Calculate the speed of the car at t=3.0s.
(b) Determine the instantaneous power being produced by the engine at that same instant.
(c) Calculate the average power delivered by the engine during the interval 0≤t≤3.0s, and compare it with the value obtained in part (b). State which is larger and explain why.