Question

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.)

Answer 1

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