JEE Main 20198 Apr, Morning shiftPhysicsHardProperties of Solids and Liquids184× since 2002
A boy's catapult is made of rubber cord which
is 42 cm long, with 6 mm diameter of
cross-section and of negligible mass. The boy
keeps a stone weighing 0.02kg on it and
stretches the cord by 20 cm by applying a
constant force. When released, the stone flies
off with a velocity of 20 ms^–1. Neglect the
change in the area of cross-section of the cord
while stretched. The Young's modulus of
rubber is closest to: