A1000 kg truck moving with a speed of 20ms^-1 is brought to rest within a distance of 50m by
applying brakes which provide uniform retardation.Find retardation and retarding force.
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mass= 1000 kg
velocity(u)= 20 m/s
final velocity = 0
distance=50 m
v^2= u^2+2as
0-u^2=2as
-20^2= 2a*50
-400= 100a
a= -4m/s^2......….........(retardation)
regarding force= ma
= 1000*-4
=-4000N
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