A car of mass travels along a straight road at a speed of
PHYSICS · Multi-part · CBSE · Physics · Work, Energy and Power · Work, Energy and Power
Problem
A car of mass 1500kg travels along a straight road at a speed of 20ms−1. Answer the following questions.
(i) Calculate the initial kinetic energy of the car.
(ii) The car now carries additional passengers so that its mass increases by 20%, but it continues to move at the same speed. Determine the new kinetic energy and the percentage change in kinetic energy with respect to the initial value.
(iii) Returning to its original mass, the car instead accelerates so that its speed increases by 20% while the mass remains 1500kg. Determine the new kinetic energy and the percentage change compared to the initial value.