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A ball is thrown with a velocity whose h...

A ball is thrown with a velocity whose horizontal component is `12 ms^-1` from a point `15 m` above the ground and `6 m` away from a verticlewall `18.75 m` high in such a way so as just to clear the wall. At what time will it reach the ground ? `(g = 10 ms^-2)`.

Text Solution

Verified by Experts

The correct Answer is:
C

`u cos theta=12.6=u cos thetat rArr t=0.5s`
`3.75=u sin thetat-1/2"gt"^(2)`
`rArr 15/4=usinthetaxx1/2-(1/2)10(1/2)^(2)rArr u sin theta=10`
`-15=10T- 1/2 10T^(2) rArr T^(2)=2T-3=0 rArr T=3x`
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