Question

A truck starts from rest and 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= 1000​

Answer 1

Answer:

Given;

u = 0m/s ( as truck starts from rest )

s = 400 m

t = 20 s

s = ut + 1/2 at^2

400 = ( 0 ) ( 20 ) + ( 1/2 ) ( a ) ( 20 ) ( 20 )

400 = 0 + 400 / 2 * a

400 = 200 a

a = 400 / 200

a = 2m/s^2

Force = mass * acceleration ( Newton's second law of motion )

f = 1000 * 2

f = 2000 newton