Question

An object of mass 5 kilograms is placed on a plane inclined at 36 degrees to the

horizontal. The object is moving down the plane with a velocity of 2 metres per second. The coefficient of kinetic friction between the box and the plank is 0.3.

Determine

(a) the frictional force. 

(b) acceleration of the box down the plane. 

(c) the distance the object travels down the plane in 8 seconds.

(g=10m/s^2)