1. a body of mass 40kg is given an acceleration of 10ms/2 on a horizontal ground for which the coefficient of friction 0.5, calculate the force required to accelerate the body (g= 10ms/2)
2. a force of 20N applied parallel to the surface of a horizontal table and just sufficient to make a block of mass 4kg move on the table. Calculate the coefficient of friction between the block and the tabla.
