A ball is given a speed v on a rough horizontal surface. The ball travels through a distance l on the surface and stops. A. What are the initial and final kinetic energies of the ball? b. What is the work done by the kinetic friction?

Consider the situation of the previous question from a frame moving with a speed v_0 parallel to the initial velocity of the block? b. What is the work done by the kinetic friction?

A body of mass 2kg is resting on a rough horizontal surface. A force of 20N is now applied to it for 10s, parallel to the surface. If the coefficient of kinetic friction between the surfaces of contact is 0.2. Calculate Work done by the applied force in 10s

A body is moving at constant speed over a frictionless surface. What is the work done by the weight?

A wheel of radius 20 cm is pushed ot move it on a rough horizontal surface. It is found to move through a distance of 60 cm on the road during the time it completes one revolutionabout the centre. Assume that the linear and the angular accelerations are uniform. The frictional force acting on the wheel by the surface is

A body is moving at constant speed over a frictionaless surface. What is the work done by the weight of the body ?

A cricket ball is hit at 45^(@) to the horizontal with a kinetic energy E . Calculate the kinetic energy at the highest point.

A string of negligible thicknes is wrapped several times around a cylinder kept on a rough horizontal surface. A man standing at a distance l from the cylinder holds one end of the sitting an pulls the cylinder towards him figure. There is no slipping anywhere. The length of the string passed through the hand of the man whicle the cylinder reaches his hands is