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 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 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 particle is projected directly along a rough plane of inclination theta with velocity u. If after coming to the rest the particle returns to the starting point with velocity v, the coefficient of friction between the partice and the plane 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 ____________ .

Asseration : A block of mass m starts moving on a rough horizontal surface with a velocity v. It stops due to friction between the block and the surface after moving through a ceratin distance. The surface is now tilted to an angle of 30^@ with the horizontal and same block is made to go up on the surface with the same initial velocity v. The decrease in the mechanical energy in the second situation is small than the first situation. Reason : The coefficient of friction between the block and the surface decreases with the increase in the angle of inclination.

A body moving on the ground with a velocity of 15m//s comes to rest after covering a distance of 25m If acceleration due to gravity is 10m//s^(2) Calculate the coefficient of friction between the ground and the body .

solid sphere of radius r is gently placed on a rough horizontal ground with an initial angular speed omega_(0) and no linear velocity. If the coefficient of friction is mu , find the time t when the slipping stops. in addition state the linear velocity v and angular velocity omega at the end of slipping

A uniform ring of mass 'm' and radius 'R' is projected horizontally with velcoty v_(0) on a rough horizontal floor, so that it starts off with a purely sliding motion and it acquires a pure rolling motion after moving a distance d. If the coefficient of friction between the ground and ring is mu , then work done by the friction in the process is

Find the distance travelled by a body before coming rest, if it is moving with a speed of 10ms^(-1) and the coefficient of friction between the ground and the body is 0.4 .