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 tons (Hint: 1 metric ton = 1000 kg).

Initial velocity, u = 0
Distance travelled, s = 400 m
Time taken, t = 20 s
We know, s = ut + ½ at2
Or, 400 = 0 + ½ a (20)2
Or, a = 2 ms€“2
Now, m = 7 MT = 7000 kg, a = 2 ms€“2
Or, F = ma = 7000 — 2 = 14000 N Ans.

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