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05/01/2021 7:19 pm
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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)
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05/01/2021 7:21 pm
Here, u = 0, s = 400 m
t = 20 s, m = 7 tonnes = 7000 kg
(i) Using, s = ut + 1/2 at2
400 = 0 + 1/2a x 400 = 200a
a = 2 ms-2
(ii) F = ma = 7000 x 2
= 14000 N