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A body is projected from the bottom of a...

A body is projected from the bottom of a smooth inclined place with a velocity of `20 ms^(-1)`, If it is just sufficient to carry it to the top in `4 s`, find the inclination and height of the plane.

Text Solution

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` v=u+at`
`rArr 0=20 -g sin theta xx 4`
`rArr sin theta=(1)/(2) rArr theta=30^(@)`
`v^(2)=u^(2)+2as`
`0^(2)=(20)^(2)+2 (-g sintheta) (h//sin theta)`
`rArr h=20 m`
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