A boy’s catapult is made of rubber made of a rubber cord of length 42 cm long, with 6 mm diameter of cross-section and of negligible mass. The boy keeps a stone weighing 0.02 kg on it and stretches the cord by 20 cm 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:
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
JEE Main 2019
When a catapult is stretched up to length 
, then the stored energy in it 
So, order is 
.
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