Question

5. A truck starts from rest and rolls down a hill with a constant 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

• The acceleration of the truck that starts from rest and rolls down a hill with a distance of 400m in 20s is 2m/s².
• The force acting on the truck if it's mass is 7 tonnes is 14,000N.

How to calculate acceleration?

The acceleration of a body can be calculated using the following equation:

s = ut + ½at²

Where;

• S = distance
• u = initial velocity
• t = time
• a = acceleration

400 = 0 × 20 + ½ × a × 20²

400 = 0 + 200a

a = 2m/s²

Force acting on the truck can be calculated by multiplying the mass of the truck by its acceleration as follows:

Force = 7000kg × 2m/s²

Force = 14,000N

Therefore;

• the acceleration of the truck that starts from rest and rolls down a hill with a distance of 400m in 20s is 2m/s².
• The force acting on the truck if it's mass is 7 tonnes is 14,000N.

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