111. A rubber cord catapult has cross-sectional area
A rubber cord catapult has cross-sectional area 25mm2 and initial length of rubber cord is It is stretched to and then released to project a missile of mass (Taking YRUBBER=5×108N/m2) velocity of projected missile is
(a) 20 m/s (b) 100 m/s
(c) 250 m/s (d) 200 m/s
Answer-c
(65)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)