Question

two balls of same size but of different materials one of iron and rubber

Answer 1

hey mate here is your answer.
Two balls of the same size but of different materials, rubber and iron, are kept on the smooth floor of a moving train. Two balls of the same size but of different materials, rubber and iron, are kept on the smooth floor of a moving train. The brakes are applied suddenly to stop the train. hope this helps you.
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Answer 2

is it a riddle...???....i guess it is