A metal plate 100`cm^2` in area rests horizontally on a layer of oil 2 mm thick.A force of 0.1 N applied to the plate horizontally keeps it moving with a uniform speed of 2cm/s . Find the viscosity of oil.

A plate of metal 0.1 m^2 in area rests on a layer of caster oil 0.2 cm thick whose co efficient of viscosity is 15.5 poise. Calculate the horizontal force required to move the plate with a speed of 0.3 m/s.

A 50 kg block rests on a rough horizontal surface. A force of 200 N is applied on the body. The block acquires a speed of 4 m//s , starting from rest in 2 seconds. The value of coefficient of friction is

A100 N force acts horizontally on a block of 10 kg placed on horizontal rough table of coefficient of friction mu=0.5g=10m//s^2 . What is the acceleration of the block ?

A steel ball of mass m is initially at rest on a horizontal frictionless surface. It is struck head on by another steel ball of mass 2m travelling with a velocity of 50 cm/s. Calculate the velocities of the two balls after a collision assuming it to be elastic.