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System is shown in the figure. Velocity ...

System is shown in the figure. Velocity of sphere `A` is `9m//s `. Then speed of sphere `B` will be `:`

A

`9m//s`

B

`12m//s`

C

`9xx(5)/(4)m//s`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
B

`9cos alpha=v sin alpha rarr (i)`
`(19-R)/(12)=tan alpha rarr (ii)`
`(R+5)^(2)=(12)^(2)+(19-R)^(2)`[Pythagorean]
`rArr R=10`
Hence from `(i)` and (ii) `v=12 m//s`
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