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:
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a
2gh
b
6gh
c
3gh
d
gh
answer is C.
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Detailed Solution
Let initial and final speeds of stone be u and v.∴ v2=u2−2gh .....(i) and vcos30∘=ucos60∘ ......(ii)solving 1 and 2 we getu=3gh
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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: