A rubber cord has a cross-sectional area 1 mm² and total unstretched length 10.0 cm. It is stretched to 12.0 cm and then…..

Q: A rubber cord has a cross-sectional area 1 mm² and total unstretched length 10.0 cm. It is stretched to 12.0 cm and then released to project a missile of mass 5.0 g. Taking Young’s modulus Y for rubber as 5.0 × 108 N/m². Calculate the velocity of the projection.

(a) 20 m/s

(b) 40 m/s

(c) 30 m/s

(d) 50 m/s

Ans: (a)

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