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An object is moving in x-y plane its vel...

An object is moving in `x-y` plane its velocity and acceleration at `t=0` are represented in figure.

After how much time object crosses the `y-`axis:-

A

`4 sec`

B

`2 sec`

C

`3 sec`

D

None

Text Solution

Verified by Experts

The correct Answer is:
A
`vec(v)=8hat(i)` " "`vec(a)=-4hat(i)-3hat(j)`
when object crosses `y`-axis
`x=0`
`x=u_(x)t+(1)/(2)a_(x)t^(2)`

`0=8t+(1)/(2)(-4)t^(2)rArrt=4 sec`.
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