# physics

A constant force acts on a 5.0 kg object and reduces its velocity from 7.0 m/s to 3.0 m/s in a time of 3.0 s. Find the force.

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1. V = Vo + a*t.
3 = 7 + a*3, a = - 1.333 m/s^2.

F = M*a = 5 * (-1.33) = -6.67 N.

The negative sign means that the force opposes the movement of the object.

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