The position-time (x - t) graph of a mov...

The position-time (x - t) graph of a moving body of mass 2 kg is shown in the figure. The impulse on the body at t = 4s is

`1.5 kg ms^-1`

`-1.5 kg ms^-1`

`1 kg ms^-1`

`2 kg ms^-1`

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