A block of mass m=10 ~kg is hanging over a frictionless light fixed...

A block of mass

m=10 \mathrm{~kg}

is hanging over a frictionless light fixed pulley by an inextensible light rope. Initially the block is held at rest. The other end of the rope is now pulled by a constant force F in the vertically downward direction. The linear momentum of the block is seen to increase by

2 \mathrm{kgm} / \mathrm{s}

in 1 s (in the first second). Therefore, A block of mass m=10 ~kg is hanging over a frictionless light fixed pulley by an inextensible light rope. Initially the

A block of mass m=10 ~kg is hanging over a frictionless light fixed pulley by an inextensible light rope. Initially the

Options

Athe tension in the rope is F
Bthe tension in the rope is 3N
Cthe work done by the tension on the block, in first second, is $=19.8 \mathrm{~J}$
Dthe work done against the force of gravity, in first second, is $=9.8 \mathrm{~J}$

Correct answer

D. the work done against the force of gravity, in first second, is $=9.8 \mathrm{~J}$

Step-by-step solution

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