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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. For this question, if I solve for acceleration by using the equation a = v - u / t , then I get 1 m/s 2 as the acceleration. But if I use the equation, S = ut + 1/2 at 2 , then I get 2 m/s 2 as the acceleration. Since none of the formulae are wrong, why is the answer different in each case ?

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. 
For this question, if I solve for acceleration by using the equation a = v - u / t , then I get 1 m/s2 as the acceleration. But if I use the equation, S = ut + 1/2 at, then I get 2 m/s2 as the acceleration. Since none of the formulae are wrong, why is the answer different in each case ? 

Grade:12th pass

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