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A body with mass 5 kg is acted upon by a...

A body with mass 5 kg is acted upon by a force `F=(-3 hati+4 hatj)N`. If its initial velocity at t=0 is `u=(6 hati-12hatj)ms^(-1)`, the time at which it will just have a velocity along the Y-axis is

A

`((3)/(5) hat(i) - (4)/(5) hat(j))N`

B

`(- 3 hat(i) + 4 hat(j) N)`

C

`(3 hat(i) - 4 hat(j))`

D

`(-(3)/(5) hat(i) + (4)/(5) hat(j))N`

Text Solution

Verified by Experts

The correct Answer is:
B
`F = (m[vec(v) - vec(u)])/(t)`
`F = (m[6 hat(j) - 6 hat(i) + 2 hat(j)])/(10)`
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