Question

A truck starts from rest and rolls down a hill with a constant acceleration. It travels a distance of `400m` in `20 s`. Find its acceleration. Find the force acting on it if its mass is `7` metric tonnes (Hint.1 metric tonne=1000kg)

Answer 1

Here, `u=0, s= 400m, t=20s`
`m =7` metric tonne `= 7xx1000kg = 7000kg, a=?, F=?`
From `s = ut+1/2at^(2), 400 =0+1/2a(20)^(2)= 200a` or `a=(400)/200 =2m//s^(2)`
`F = ma= 7000xx2= 14000N`