Physics - NLM Question with Solution | TestHub

Figure shows a light, inextensible string attached to a cart that can slide along a frictionless horizontal rail aligned along an x axis. The left end of the string is pulled over a pulley, of negligible mass and friction and fixed at height $h=3\mathrm{m}$ from the ground level. The cart slides from $x_1=3\sqrt{3}\mathrm{m}$ to $x_2=4\mathrm{m}$ and during the move, tension in the string is kept constant at 50 N . Find change in kinetic energy of the cart in joules.