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