A block of the mass of 1 kg is moving on...

A block of the mass of 1 kg is moving on the x -axis. A force F acting on the block is shown. The veloity of the block at time t = 2 s is `-3ms^(-1)`. What is the speed of the block at time t = 4 s?

`8ms^(-1)`

`2ms^(-1)`

`3ms^(-1)`

`5ms^(-1)`

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