A small body is projected with a velocity of `20.5 ms^(-1)` along rough horizontal surface. The coefficient of friction `(mu)` between the body and surface changes with time t (in s) as the the body moves along the surface. Find the velocity at the end of 4s in m/s

A block is projected with speed 20 m/s on a rough horizontal surface. The coefficient of friction (mu) between the surface varies with time (t) as shown in figure. The speed of body at the end of 4 second will be (g=10m//s^(2))

A body is projected with velocity 60m//s at 30^(@) to the horizontal.The velocity of the body after 3 seconds is

A body of mass 2 kg is projected with an initial velocity of 5 ms^(-1) along a rough horizontal table. The work done on the body by the frictional forces before it is brought to rest is

A body of mass m, having momentum p, is moving on a rough horizontal surface. If it is stopped in a distance x, the coefficient of friction between the body and the surface is given by

A body of mass 2 kg is being dragged with uniform velocity of 2 m / s on a rough horizontal plane. The coefficient of friction between the body and the surface is 0.20. The amount of heat generated in 5 sec is . (4.2"joule"//cal and g=9.8 m//s^(2))

A body of mass m kept on the floor of a lift moving downwards is pulled horizontally. If mu is the coefficient of friction between the surface in contact, then

A horizontal force is applied on a body on a rough horizontal surface produces an acceleration a .If coefficient of friction between the body and surface which is a is reduced to mu//3 ,the acceleration increses by 2 units .The value of mu is

The coefficient of friction between a body and the surface of an inclined plane at 45^(@) is 0.5. if g=9.8m//s^(2) , the acceleration of the body downwards I m//s^(2) is

A force F=2t is spplied at t=0 sec to the block of mass m placed on a rough horizontal surface. The coefficient of static and kinetic friction between the block and surface are mu_S and mu_k rspectively. Which of the following graphs best represents the acceleration vs time of the block (mu_Sgtmu_k) ?