A particle starts from rest at =0 and moves in a straight line with an acceleration as shown in figure . The velocity of the particle ar t=3 s is

Options

A. A)`2ms^(-1)`
B. B)`4ms^(-1)`
C. C)`6ms^(-1`
D. D)`8ms^(-1)`

Answer

B

Explanation

Velocity at 3 s = total algebraic sum of area under the curve
or `v=4xx2-4xx1`
`=8-4=4ms^(-1)`