Posted by **Elle** on Tuesday, November 29, 2011 at 10:44pm.

Two bullets have masses of 2.4 g and 5.2 g, respectively. Each is ﬁred with a speed of 37.0 m/s.

a) What is the kinetic energy of the ﬁrst

bullet?

b) What is the kinetic energy of the second bullet?

I initially used KE=1/2MV^2 and got 1642.8 J, but got it wrong. What is my mistake?

- Physics -
**Henry**, Wednesday, November 30, 2011 at 8:23pm
Mass is measurd in kg Not grams. S0 you

must convert to kg:

divide grams by 1000.

- Physics -
**Elle**, Wednesday, November 30, 2011 at 8:54pm
I see! Thank you!

- Physics -
**Elle**, Wednesday, November 30, 2011 at 8:58pm
Another quick question, what is the ratio

K2/K1 of their kinetic energies. Is, it just dividing the second bullet's KE to the first?

- Physics -
**Henry**, Thursday, December 1, 2011 at 7:41pm
The ratio of K2 to K1 = K2/K1.

The ratio of K1 to K2 = K1/K2.

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