A car of mass 1000 kg moving with a velocity of 30m/s applies break and stop after 3s. Find the magnitude of retarding force, the distance travelled by the car before it came to rest and the work done by the breaking force.

Answer 1

a. V = Vo + a*t.
9 = 30 + a*3, a = -10 m/s^2.
F = M*a. The retarding force will be negative.

b. V^2 = Vo^2 + 2a*d.
0 = 30^2 -20d, d = ?.

c. Work = F*d in Joules.