Question

A car of mass 250 kg with a load of 120 kg packed inside of it is moving along a road at a speed 20 m/s. Find the kinetic energy of the car

Answer 1

Answer:

Explanation:

Given , Mass of object, m=10 kg

Velocity of object, v=20ms  

−1

 

Initial Kinetic energy, K  

1

​  

=  

2

1

​  

×10×20  

2

=2000 J

Now, Final mass, m  

2

​  

=20 kg

Final Velocity, v  

2

​  

=10m/s

Final Kinetic energy, K  

2

​  

=  

2

1

​  

×20×10  

2

=1000 J

Required Ratio =  

K  

2

​  

 

K  

1

​  

 

​  

=  

1000

2000

​  

=2:1