A truck starts from rest and rolls down a hill with a constant acceleration. It travels a distance of 400 m in 20 s.

Monjur Alahi

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 metric tonnes 

(Hint: 1 metric tonne = 1000 kg.)


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Salim Ahmed Kawsar

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Initial velocity of the truck, u = 0 m/s 

Time taken, t = 20 s 

Distance covered by the stone, s = 400 m 

According to the second equation of motion: 

s = ut + 1/ 2 at 2 

We have 

400 = 0 × 20 + 1 /2 × × (20) 2 

⇒ 400 = 200 

⇒ = 2 m/s2 

Now, Force = mass × acceleration 

⇒ F = 7000 × 2 = 14000 N

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