83. If a spring is extended to length l, then according to Hook’s law
(a) F=kl (b) F=k/l
(c) F=k 2l (d) F=k 2 /l
Answer=a
(10)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)