A truck is moving with a velocity if 72km/h and it takes 3s to stop after the brakes are applied.calculate the force exerted by brakes.mass of truck is 1200kg.
m = 1200 kg
u =0
v = 72kms/hr = 20 m/s
t = 3 secs
v = ut + at
20 = 0 + ax3
a = 20/3 =6.66
F = ma
F = 1200 x 6.66
F = 7992 N