InterviewSolution
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InterviewSolution
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A vertical spring with force constant `k` is fixed on a table. A ball of mass `m` at a height `h` above the free upper end of the spring falls vertically on the spring , so that the spring is compressed by a distance `d`. The net work done in the process isA. `mg(h+d)+(1)/(2)kd^2`B. `mg(h+d)-(1)/(2)kd^2`C. `mg(h-d)-(1)/(2)kd^2`D. `mg(h-d)+(1)/(2)kd^2` |
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Answer» Correct Answer - B Loss in P.E. `=` gain in the spring energy `mg(h+d)=(1)/(2)kd^2` net work done `=mg(h+d)-(1)/(2)kd^2` |
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