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A particle is projected from a point A w...

A particle is projected from a point `A` with velocity `sqrt(2)u` an angle of `45^(@)` with horizontal as shown in figure. It strikes the plane `BC` at right angles. The velocity of the particle at the time of collision is

A

(a)`(sqrt(3)u)/2`

B

(b)`u/2`

C

(c)`(2u)/sqrt(3)`

D

(d)u

Text Solution

Verified by Experts

The correct Answer is:
C

`rArr usqrt2 cos 45^(@)=v sin 60^(@)`
`rArr u=(sqrt3v)/(2) rArr v=(2u)/(sqrt3)`
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