A block of mass \( M \) is hanging over a smooth and light pulley through a light string. The ot...
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0A block of mass \( M \) is hanging over a smooth and light pulley through a light string. The other end of the string is pulled by a constant force \( F \). The kinetic energy of the block increases by \( 20 \mathrm{~J} \) in \( 1 \mathrm{~s} \). Now, choose the correct statement:
(A) The tension in the string is \( M g \).
(B) The tension in the string is \( F \);
(C) The work done by the tension on the block is \( 20 \mathrm{~J} \) in the above \( 1 \mathrm{~s} \).
(D) The work done by the force of gravity is \( -20 \mathrm{~J} \) in the above \( 1 \mathrm{~s} \).
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