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In the Q. 122 what will be the velocity ...

In the Q. 122 what will be the velocity of the particle when it returns to the starting point?

A

`vecr_(0)`

B

`-vecr_(0)`

C

`2vecr_(0)`

D

`-2vecr_(0)`

Text Solution

Verified by Experts

The correct Answer is:
B
`vecr=vecr_(0)t-vecr_(0)at^(2)`
`rArr vecv=(dvecr)/(dt)=vecr_(0)-vecr_(0)a2t`
Returning at `t=(1)/(a)`
`rArr vecv_(1//a)=vecr_(0)-2vecr_(0)axx(1)/(a)`
`rArr vecv=-vecr_(0)`
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