A block is projected from bottom of an inclined plane with some velocity as shown in figure

A block is projected from bottom of an inclined plane with some velocity as shown in figure. If initial velocity of block is 40 m/sec and μ = 1/√3 then find
Time to reach maximum height.
(a) 8 sec (b) 16 sec
(c) 4 sec (d) 24 sec

Friction force at maximum height.
(a) 100 N (b) 50 N
(c) zero (d) 25 N