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16th of September 2015
Physics
Q:

A heavy leather ball and a light tennis ball of equal size are kept on the floor of a moving train when train is suddenly stopped, they are set in motion. In which direction will they move? Which one of them will attain higher velocity? (Assume that friction is same for both).

Sayani Roy - CBSE - Class IX

Wednesday, September 16, 2015 at 18:37:PM

A:

Hi Sayani,

The balls are kept on the floor of a moving train.

So, when brakes are applied, the balls will start moving in the forward direction due to inertia of motion.

Since, friction is same, both of them will get the same force of push.

So, the acceleration of heavy ball will be less as a = F/m

Hence, light tennis ball will attain higher velocity.

Wednesday, September 16, 2015 at 18:50:PM