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At a given instant, A is moving with vel...

At a given instant, `A` is moving with velocity of `5m//s` upwards. What is velocity of `B` at that time

A

`15 m//s darr`

B

`15 m//s uarr`

C

`5 m//s darr`

D

`5 m//s uarr`

Text Solution

Verified by Experts

The correct Answer is:
A
`l_(1) = 2l_(2) +l_(3) =` constant
`(dl_(1))/(dt) +2(dl_(2))/(dt) +(dl_(3))/(dt) =0`
`-5 +2(-5) +(dl)/(dt) = 0`
`(dl_(3))/(dt) = 15m//s`
`rArr v_(B) = 15m//s darr`
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