Question

State whether the given statement is True or False :

A 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 $40$ $J$ in $1$ $s$. The tension in the string is $F$.

• A. True
• B. False

Answer 1

The correct option is A True

Since a force $F$ is pulling the string, the tension in the string is $F$.
However the forces acting on the block are tension=$F$ upwards and weight=$Mg$ downwards and thus has a net acceleration upwards.