Which has the larger kinetic energy, a 10 g bullet fired at 400 m/s or a 80 kg bowling ball rolled at 6.5 m/s?

Formulae for Kinetic energy is:

Kinetic Energy = 1/2xmassx (velocity) ^2

For comparison we need to have same units, thus we convert 10g into Kg.

10g/1000=0.01Kg

Input the value of bullet in the formulae;

Kinetic Energy = 1/2x0.01kgx (400) ^2

K. E=800J

Input value of the ball:

Kinetic Energy=1/2x80kgx (6.5) ^2

K. E=1690J

Which means that th Energy of the ball is more than the bullet.