A boy has a catapult made of a rubber cord of length `42 cm` and diameter `6.0 mm`. The boy
Channel: Doubtnut
Date: 2020-07-26

A boy has a catapult made of a rubber cord of length `42 cm` and diameter `6.0 mm`. The boy stretches the cord by `20 cm` to catapult a stone of mass `20 g`. The stone flies off with a speed of `20 ms^(-1)`. Find Young's modulus for rubber. Ignore the change in the cross section of the cord in streching.