A boy's catapult is made of rubber cord which is 
long, with 
diameter of cross - section and of negligible mass. The boy keeps a stone weighing 
on it and stretches the cord by 
by applying a constant force. When released, the stone flies off with a velocity of 
. Neglect the change in the area of cross section of the cord while stretched. The Young's modulus of rubber is closest to:
Text Solution
Verified by ExpertsB
Energy of catapult 
Kinetic energy of the ball 
Therefore, 
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