1.

A body is projected horizontally from the top of a tall tower with a velocity of 30ms^(-1). At time t_(1), its horizontal and vertical components of the velocity are equal and at time t_(2), its horizontal and vertical displacements are equal. Then t_(2)-t_(1) is (take, g=10ms^(-2))

Answer»

1 s
1.5 s
2 s
3 s

Solution :As PER FIRST condition,
`30=10t_(1)`
`t_(1)=3s`
As per SECOND condition,
`30t_(2)=1/2xx10t_(2)^(2)=t_(2)=6s`
`therefore" "t_(2)-t_(1)=3s`


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