A boy pulls a 5 kg block 20 metres along a horizontal sur- face at a constant speed with a force directed 45° above the horizontal. If the coefficient of kinetic friction is 0.20, how much work does the boy do on the block?

A boy pulls 5 kg block by 20 m along a horizontal surface at constant speed with a force directed 45^(@) above the horizontal. If the coefficient of friction is 0.2, then

A worker pushed a 23 kg block 8.4 m along a level floor at constant speed with a force directed 32^(@) below the horizontal . If the coefficient of kinetic friction between block and floor was 0.20, what were (a) the work done by the worker's force and (b) the increase in thermal energy of the block-floor system ?

A block of weight 200 N is pulled along a rough hori zontal surface at constant speed by a force 100 N acting at an angle 30^(@) above the horizontal. The coefficient of kinetic friction between the block and the surface is :

A block of weight 200N is pulled along a rough horizontal surface at contant speed by a force of 100N acting at an angle 30^(@) above the horizontal. The coefficient of kinetic friction between the block and the surface is .

A block of weight 200N is pulled along a rough horizontal surface at constant speed by a force 100N acting at an angle 30^(@) above the horizontal. The coefficient of friction between the block and the surface is

A wooden block of mass M resting on a rough horizontal surface is pulled with a force F at an angle  with the horizontal. If  is the coefficient of kinetic friction between the block and the surface, then acceleration of the block is -