a car of mass 800kg is travelling with a velocity of 20m/s. when brakes are applied it stops after travelling a distance of 8 m. find the retardation and retarding force.
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m=800Kg
u=20m/s
v=0
s=8m
v squared- u sqaured= 2as
0-400=16a
-400/16=a
a=-25m/s squared
retardation= 25m/s sqaured
f=ma
f= 800*-25 N
=-20000N
retarding force is 20000N