PHYSICS · Multi-part · CBSE · Physics · Work, Energy and Power · Work, Energy and Power
Problem
Two cars, A and B, are moving on the same straight road. Car A has mass 800kg and is travelling at 20m/s. Car B has mass 1200kg and is travelling at 15m/s.
(i) Calculate the kinetic energy of each car.
(ii) Find the ratio KEBKEA in its simplest form.
(iii) Car B now increases its speed until its kinetic energy becomes equal to that of car A, while its mass remains unchanged. Determine the new speed of car B.
(iv) If instead car A wishes to have double its present kinetic energy without changing its mass, what speed must it attain?