# Physics

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Joanne drives her car with a mass of 1000 {\rm kg} at a speed of 23m/s .

Find a road friction force that is need to bring her car to a halt in 14s .

• Physics -

V = Vo + a*t.
a = (V-Vo)/t = (0-23)/14 = -1.64 m/s^2.

F = m*a = 1000*(-1.64) = -1640 N.

The negative sign means that the force
is opposing vehicle movement.

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