The position-time graph of a particle of...

The position-time graph of a particle of mass 0.1 kg is shown. The impulse at t = 2s is :

A

`0.2 kg ms^-1`

B

`-0.2 kg ms^-1`

C

`0.1 kg ms^-1`

D

`-0.4 kg ms^-1`

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