Three blocks with masses m, 2m and 3m are connected by strings, as shown in the figure. After an upward force F is applied on block m, the masses move upwards at constant speed v. What is the net force on the block of mass 2m ? (g is the acceleration due to gravity)

A stone is dropped from a height h. It hits the ground with a certain momentum P. If the same stone is dropped from a height 100% more than the previous height, the momentum when it hits the ground will change by

A conveyor belt is moving at a constant speed of 2 ms^$$-$$1. A box is gently dropped on it. The coefficient of friction between them is $$\mu $$ = 0.5. The distance that the box will move relativce to belt before coming to rest on it, taking g = 10 m s^$$-$$2,, is

A person of mass 60 kg is inside a lift of mass 940 kg and presses the button on control panel. The lift starts moving upwards with an acceleration 1.0 m/s². If g = 10 ms^$$-$$2, the tension in the supporting cable is