Solve question number 4 in orce and law of motion chapter
Solution:
Q4
Yes, the balls will starts rolling in the direction in which the train was moving. Due to the application of the brakes, the train comes to rest but due to inertia the balls try to remain in motion, therefore they begin to roll. Since the mass of the balls are not same, therefore , the inertia of iron ball is greater than rubber ball due to mass. Thus, the rubber ball will move fast.