Need with a momentum and impulse physics question on image below 6.3

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[grade 12 momentum -physics questions need assisance with 6.3][1]

How to calculate the final velocity of a body given two graphs of two objects of net force versus time [1]: https://i.stack.imgur.com/u7UZq.jpg

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In 6.1 you have calculated the total impulse p for Q. To get from impulse to velocity you can use the definition of impulse: p = mv. Therefore you need the mass m of the object Q, which seems not be given. With the data given the answer would be:

final velocity = v = 60 / m in m/s