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physics momentum question

does anyone know how to do this question:
the ball strikes the plate with a speed of 7.1ms and has a mass of 45g. it leaves the plate with a speed of 3.9ms show that this is consistent with a change in momentum about 0.5ms.
(3 marks)
Reply 1
I'm guessing the ball is bouncing back in the opposite direction so you need to set either the before or the after velocity negative before you start to do your momentum calculations. momentum is a vector and it works with velocity, speed is a scalar.

NB The units for momentum are kg.m/s
ms is a millisecond
Reply 2
perfect thank you!
think the units in the question was Ns and I just types it in wrong

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