ScienceClass 9CBSE
Q
A rocket is moving up with a velocity v. If the velocity of this rocket is suddenly tripled, what will be the ratio of two kinetic energies?
A
Soln:
Initial velocity=v=3v
Initial kinetic energy= 1v2
2
Kinetic energy= 1v2
2
1m(3v)2= 9(1 mv2)
2 2
Ratio between Initial kinetic energy and final kinetic energy is 1:9