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

Explanation:

u=0 s=400 t=20s a=?

s=ut+1/2at^2

400=0+0.5a(20*20)

a=2m/s^2

F=ma

 =7000*2

 =14,000N

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Answer 2

Answer:

Explanation:

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