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There are 5,280 feet in 1 mile.
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Momentum is a term used to quantify the motion of an object has. It is calculated as the the product of the object's mass and the velocity. It is expressed as:
Momentum = m x v
Momentum = 50 kg x 5 m/s
Momentum = 250 kg m/s
Therefore, the correct answer is the last option.
You get the net force acting on it ... the sum of the strengths and directions
of all the individual forces there may be.