21. When a 4 kg mass is hung vertically on a light spring that obeys Hooke’s law, the spring stretches by 2 cms. The work required to be done by an external agent in stretching this spring by 5 cms will be
21. When a 4 kg mass is hung vertically on a light spring that obeys Hooke’s law, the spring stretches by 2 cms. The work required to be done by an external agent in stretching this spring by 5 cms will be(g=9.8 m/sec2)
(a) 4.900 joule (b) 2.450 joule
(c) 0.495 joule (d) 0.245 joule
Answer-b
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a