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

`2 ms^(-2),14000 N`

Explanation

Initial velocity , u=0
Distance travelled , s=400m
Time taken, t=20s
We know, s`=ut+1//2at^(2)`
Or, 400 =`0+1//2a(20)^(2)`
Or, a `=2 ms^(-2)`
Now, m=7 metric tonne= 7000 kg, a `=2 ms^(-2)`
Or, F`=ma=7000xx2=14000N`