1.

A body starts from a point with a velocity and uniform acceleration a. The direction of acceleration is reversed when the velocity of the body becomes 5u. The velocity of body al point will be

Answer»

`-v`
`-5v`
`-7V`
`-9V`

Solution :Here `v^(2)-U^(2)=2aS` =Constant
`:. (5v)^(2)-v^(2)=v^(2)-(5v)^(2)`
or `v^(2)=49v^(2)` or v=-7v
neglecting+ ve sign


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