A block is placed on a rough wedge fixed on a lift as shown in figure. A string is also attached with the block. The whole system moves upwards. Block does not lose contact with wedge on the block. Match the following two columns regarding the work done (on the block).

Column-I Column-II
A Work done by normal reaction P positive
B Work done by gravity Q negative
C Work done by friction R zero
D Work done by tension S Can’t say anything

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$A - Q, B - P, C - R, D - P$

$A - R, B - R, C - Q, D - P$

$A - P, B - Q, C - R, D - P$

$A - R, B - Q, C - R, D - R$

answer is B.

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Detailed Solution

Friction Force =0, as tension will serve that purpose

Angle between N and S or between T and S is acute

∴W_T and W_N are positive. Angle between S and mg is 180⁰.

Therefore, W_mg is negative.

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