# A car of mass 2400 kg moving with a velocity of 20 m s-1 is stopped in 10 seconds on applying brakes. Calculate the retardation and the retarding force.

Mass, m = 2400 kg

Initial velocity, u = 20 m/s

Time, t = 10 s

Final velocity, v = 0 m/s

We know that,

a = v-u/t

=-20/10

=-2 m/s2

Now,

Force, F = ma

=2400 (-2)

= 4800 N

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