A 75.0 kg object decelerates from a speed of 100 m/s to 50 m/s over an interval of 25 seconds. What was the net force acting upon the object that caused this change in momentum?

Assuming constant acceleration a, the object has undergoes an acceleration of

a = (50 m/s - 100 m/s) / (25 s) = -2 m/s²

Then the net force has a magnitude F such that, by Newton's second law,

F = (75.0 kg) a

F = (75.0 kg) (-2 m/s²)

F = -150 N

meaning the object is acted upon by a net force of 150 N in the direction opposite the initial direction in which the object is moving.

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