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A ball is thrown horizontally from a poi...

A ball is thrown horizontally from a point O with speed 20 m/s as shown. Ball strikes the incline along normal after two seconds
The value of angle `beta` will be

A

` 30^@`

B

`45^@`

C

`60^@`

D

`53^@`

Text Solution

Verified by Experts

The correct Answer is:
B
`u_(x)=20 cos beta" "u_(y)=-20 sin beta`
`a_(x)=-g sin beta a_(y)=-g cos beta`
When ball strikes the plane, normally `V_(x)=0`
`V_(x)=u_(x)+a_(x)t=0, tan beta=1, beta=45^(@)`
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