Fundamentholfundamenthol
JEE Main2019Physics
Q.

A boy’s catapult is made of rubber cord which is 42 cm long, with 6 mm diameter of crosssection 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 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: 

  1. A

    104 Nm–2

  2. B

    103 Nm–2

  3. C

    108 Nm–2

  4. D

    106 Nm–2

Solution

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