A) Zero
B) \[\sqrt{2gh}\]
C) \[\sqrt{gh}\]
D) \[\frac{\sqrt{3gh}}{2}\]
Correct Answer: A
Solution :
[a] Work done by gravity [conservative force] depends on initial and final positions, both the points are at the same level of height. Speed of the block at point Q is same as that at point P, i.e. zero.
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