Question

A bus start fromm rest and moves 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 metric tonnes.

Answer 1

u=0
t=20
s=400

s=ut+1/2at^2
400=0+×20+1/2a×(20)^2
400=1/2a×400
400/400=1/2a
2=a
so,a=2m/s^2

Force=ma
=7000kg×2m/s^2
=14000kgm/s^2