A mover loads a 100 kg box into the back of a moving truck by
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The momentum of a moving object is given by:
where m is the mass of the object and v its speed.
In this problem, the ball has a mass of
and its momentum is 
, so we can rearrange the previous equation to find the speed of the ball:
where m is the mass of the object and v its speed.
In this problem, the ball has a mass of