A block is projected up along a rough incline with a velocity of u = 10 m/s. After 4 s the block was at point B at a distance of 5 m from the starting point A and was travelling down at a velocity of v = 4 m/s.

(a) Find time after projection at which the block came to rest.
(b) Find the coefficient of friction between the block and the incline.
Take `g = 10 m//s^(2)`

Answer

`(13)/(7)` s
(b) 0.18