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.)

NCERT Class IX
Sciences - Main Course Book

Chapter 9. Force and Laws of Motion

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2015-05-22T13:31:41+05:30

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U = 0
s = 400 m
t = 20 sec
s = u t + 1/2 a t^2
 400 =  0 + 1/2 * a * 20^2
 
=>  a  =  2 m/sec

F = m * a  = 7 * 1000 * 2 = 14 kNewtons



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