A) \[36\sqrt{7}\]
B) \[4\sqrt{5}\]
C) \[mg(h+d)+\frac{1}{2}k{{d}^{2}}\]
D) \[mg(h+d)-\frac{1}{2}k{{d}^{2}}\]
Correct Answer: B
Solution :
Key Idea Work done is equal to change in energy of body. Situation is shown in figure. When mass m falls vertically on spring, then spring is compressed by distance d. Hence, network does in the process is W = potential energy stored in the spring + loss of potential energy of mass \[=20\times {{10}^{10}}=2\times {{10}^{11}}N/{{m}^{2}}\]You need to login to perform this action.
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