Question

A truck starts from rest & rolls down a hill with a constant acceleration. It travels a distance of 400m in 20s find its acceleration find the force acting on it if its mass is 7 tonnes. [Hint 1 tonne = 1000Kg]
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Answer 1

Answer:

a=2,F=14,000N

Explanation:

u=0 , starts from rest

t= 20s

a= 400 m

s=ut+1/2at^2

400= 1/2*a*20*20 [ut becomes 0 because u is zero]

a=400/200,a=2m/s^2

Now by the force eqn. F=ma

F=7000*2=14,000N