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Questions  

If a stone is to hit at a point which is at a distance d away and at a height h above the point from where the stone starts, then what is the value of initial speed u if the stone is launched at an angle θ?

 

a
gcos θd2(d tan θ-h)
b
dcos θd2(d tan θ-h)
c
gd2h cos2θ
d
gd2(d-h)

detailed solution

Correct option is B

h = (u sin θ)t-12gt2d = (u cos θ)tor t = du cos θh = u sin θ.du cos θ-12gd2u2cos2 θu = dcos θg2(d tan θ-h)

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