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Statement-1: when a man raises himself up by pulling down on a horizontal bar as in gymnasium, it is work done by the normal reaction from the bar that goes on to increase his potential energy.
Statement-2: Normal force applied by the bar on the man is responsible for lifting the center of mass of the man.

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If both statements are true and statement 2 is the correct explanation of statement 1.

If both statements are true but statement 2 is not the correct explanation of statement 1.

If statement1 is true and statement 2 is false.

If statement 1 is false and statement 2 is true.

answer is D.

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Detailed Solution

Statement-1 is false because normal force cannot do any work in the absence of any displacement. The
Statement-2 is correct because an external force alone can shift the position of center of mass.
Hence, the correct answer is (D)

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