Question

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

Answer 1

Explanation:

a=400/20

=20m/s

F=ma

=7000*20

=140,000N

Answer 2

Answer:

S=UT+1/2AT2

Then

400=0+1/2×(20)2×a

So

400=1/2×400×a

So

A=2m/s2

Explanation:

F=ma

So 7000×2

F=14000N