Hard
Question
A stone projected at an angle of 60o from the ground level strikes at an angle of 30o on the roof of a building of height ′h′. Then the speed of projection of the stone is :
Options
A.
B.
C.
D.
Solution
Let initial and final speeds of stone be u and v.
∴ v2 = u2 − 2gh .........(1)
and v cos 30o = u cos 60o ..........(2)
solving 1 and 2 we get
u =
∴ v2 = u2 − 2gh .........(1)
and v cos 30o = u cos 60o ..........(2)
solving 1 and 2 we get
u =
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