Question

An object of mass 10 kg is placed on a plane inclined at an angle of 30 degrees

to the horizontal. The coefficient of kinetic friction between the object and the

plane is 0.12. The object is initially moving down the plane with a velocity of

4 metres per second. Calculate

(a) The acceleration of the block down the plane 

(b) The distance the object moves down the plane in the first five seconds.