A block is projected from bottom of an inclined plane with some LM 07 DPP Q87 & 88

A block is projected from bottom of an inclined plane with some velocity as shown in figure (problems 8 to 9). If initial velocity of block is 40 m/sec and μ = 1/√3 then find
87. Time to reach maximum height.
(a) 8 sec
(b) 16 sec
(c) 4 sec
(d) 24 sec

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

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