Question

A rubber cord catapult has cross_sectional area 25 mm² and initial length of rubber cord is 10 cm. it is stretched to 5 cm and then released to project a missile of mass 5 g . talking Y rubber=5× 10 power 8 Nm-², velocity projected missile is
(a) 20 ms-¹ (b) 100ms-¹
(c) 250ms-¹ (d) 200ms-¹​

Answer 1

Answer:

The rubber cord of a catapult has a cross-sectional area 1mm2 and total unstretched length 10cm. It is stretched to 12cm and then released to project a missile of mass 5gm.

so the answer is ( c)