A person of mass 2 kg is moving with speed 5m/s jumps on the trolley of mass 3 kg which is initially at rest. There is no friction between trolley and ground but there is friction between trolley and person. After some time both achieve common velocity. Find the work done by friction on trolley in Joules.

A plank of mass 10 kg and a block of mass 2 kg are placed on a horizontal plane as shown in the figure. There is no friction between plane and plank. The coefficient of friction between block and plank is 0.5 .A force of 60 N is applied on plank horizontally. In first 2 s the work done by friction on the block is

A body of mass 2 kg is moving on the ground comes to rest after some time. The coefficient of kinetic friction between the body and the ground is 0.2. The etardation in the body is

A boat of mass 1000 kg is moving with a velocity of 5 m//s. A person of mass 60 kg jumps into the boat. The velocity of the boat with the person will be -

A man of mass 80kg pushes box of mass 20kg horizontaly. The man moves the box with a constant acceleration of 2 m//s^(2) but his foot does not slip on the ground. There is no friction between the box and the ground. There is no friction between the box and the ground. whereas there is sufficient friction between the man's foot and the ground to prevent him from slipping. Assertion:- The force applied by the man on the box is equal and opposite to the force applied by the force applid by the box on the man. Reason:- Friction force applied by the ground on the man is 200N.

A boy of mass 60 kg running at 3//s jumps on to a trolley of mass 140 kg moving with a velocity of 1.5m//s in the same direction . What is their common velocity?

A block of mass 2kg is placed on the surface of trolley of mass 20kg which is on a smooth surface.The coefficient of friction between the block and the surface of the trolley is 0.25 .If a horizontal force of 2 N acts on the block, the acceleration of the system in ms^(-2) is (g=10ms^(-2))

A boy of mass 50 kg running at 5 m/s jumps on to a 20 kg trolley travelling in the same direction at 1.5 m/s. What is their common velocity ?

In the show arrangement mass of A=1 kg, mass of B= 2kg. Coefficient of friction between A and B =0.2 There is no friction between B and ground. The frictional force exerted by A on B equals.

A boy of mass m is riding on a trolley of mass M which is moving on smooth floor at speed v_(0) . He jumps off in the opposite direction of motion of trolley with velocity u relative to the trolley before the jump. Find the velocity of the trolley after jump.

A trolley of mass M is attached to a block of mass m by a string passing over a frictionless pulley as shown in the figure. If the coefficient of friction between the horizontal surface and wheels of trolley is mu , then acceleration of the block m and that of trolley M on releasing the system is :-