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 0.02 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 |
|||

(a) |
10 |
(b) |
10 |

(c) |
10 |
(d) |
10 |

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 0.02 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 |
|||

(a) |
10 |
(b) |
10 |

(c) |
10 |
(d) |
10 |

1 Answer

127 votes

( I)^{2} = mv^{2}

⇒ Y=

=

= 2.3 10^{6} N/m^{2 }

So, order is 10^{6}.

127 votes

127