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Q.

A bolt of mass 0.3kg falls from the ceiling of an elevator moving down with an uniform speed of 7m/s. It hits the floor of the elevator (length of the elevator = 3m) and does not rebound. What is the heat produced by impact?

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a

8.82 J

b

7.72 J

c

6.62 J

d

5.52 J

answer is A.

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Detailed Solution

Heat produced = loss of potential energy = mgh

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A bolt of mass 0.3kg falls from the ceiling of an elevator moving down with an uniform speed of 7m/s. It hits the floor of the elevator (length of the elevator = 3m) and does not rebound. What is the heat produced by impact?