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a ball is projected from groun with speed 10root 3 making angle 60 from horizontal. after how much time its velocit makes an angle of 60 with vertical.

a ball is projected from groun with speed 10root 3 making angle 60 from horizontal. after how much time its velocit makes an angle of 60 with vertical.

Grade:12th pass

1 Answers

Shubham Singh
199 Points
7 years ago
after t=1sec
let velocity be v
10root3 cos60o = v sin60o    (horizontal component remains same)
so v=10
vertical component of v = v cos60o
                                   = 10 cos60o
                                   = 5
vertical component of initial velocity = 15
let t be time taken
15 = 5 +10t
so t=1

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