A truck starts from rest and rolls down a hill with a constant acceleration . It travels a distance of 400m in 20 sec . Find its acceleration . Find the force acting on it if its mass is 7 tonnes .
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Answer:
Given data:
Mass of stone(m)=7000 kg
Distance(S)=400 meter
Time(t)=20 second
1) We have to find the acceleration of the truck
So from the equation of motion S=ut+
2
1
a×t
2
, whereu=0
S=
2
1
a×t
2
a=
t
2
2×S
=
20×20
2×400
=2
sec
2
m
2) Force acting on truck
So,from newton's 2
nd
law of motion
F
=ma=7000×2=14000N=14kN
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Toppr
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