A truck starts from rest and roll downs a hill .It travels a distance of 400m in 20s .Find the force acting upon .Why can't we use the formula a= v-u/t?If we can please tell me the answer.
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Explanation:
f = ma
f = 2m (m - mass is unknown)
we can't use the formula a = v-u/t
because we don't know v so we can't use it.
s = ut + 1/2at^2
400 = 1/2at^2
800 = a(400)
a = 2 m/s^2
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