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two bullets have masses of 3.0 g and 6.0 g, respectively. both are fired with a speed of 40.0 m/s. Which bullet has more kinetic energy? What is the ratio of there kinetic energies?



Answer :

MathPhys

Answer:

The heavier bullet has twice as much kinetic energy.

Explanation:

Kinetic energy is half the mass times the square of the speed.

KE = ½ mv²

The kinetic energy of the first bullet is:

KE = ½ (0.003 kg) (40.0 m/s)²

KE = 2.4 J

The kinetic energy of the second bullet is:

KE = ½ (0.006 kg) (40.0 m/s)²

KE = 4.8 J

The heavier bullet has twice as much kinetic energy as the lighter bullet.

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