A block begins to move on a rough horizontal surface with an initial velocity u. If it loses of its initial kinetic energy in time t, the coefficient of kinetic friction between the block and the surface is

A aprtical moves on a rough horizontal ground with same initial velocity say v_(0) . If (3//4)th of its kinetic energy is lost in friction in time t_(0) , then coefficient of friction between the partical and the ground 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 -

A particle moves move on the rough horizontal ground with some initial velocity V_(0) . If (3)/(4) of its kinetic enegry lost due to friction in time t_(0) . The coefficient of friction between the particle and the ground is.

A horizontal force of 20 N is applied to a block of 10 kg resting on a rough horizontal surface. How much additional force is required to just move the block, if the coefficient of static friction between the block and the surface is 0.4 ?

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 slides with a velocity of 10 m/s on a rough horizontal surface. It comes to rest after covering a distance of 50 metre. If g is 10m//s^(2) , then the coefficient of dynamic friction between the block and the surface is

A block starts moving up an inclined plane of inclination 30^@ with an initial velocity of v_0 . It comes back to its initial position with velocity (v_0)/(2) . The value of the coefficient of kinetic friction between the block and the inclined plane is close to I/(1000) , The nearest integer to I is ____________ .

Acceleration of block A varies with time as shown in figure the value of coefficient of kinetic friction between block A and B is