A truck starts from rest and rolls down a hill with a constant acceleration. It travels a distance of 400 m in 20 sec. find its acceleration. Find the force acting on it if its mass is 7 metric tons.
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according to the question,
initial velocity of truck (u) =0
distance (s)=400 m
and time =20 second
mass of truck =7 metric tons= 7000kg
s=ut+1/2 at*2
400=0*20+1/2*a*20*2
400=0+1/2*400a
400=0+200a
400/200=a
2m/s*2=a
therefore,f= m*a=7000*2=14000N
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