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.

## Answer this Question

## Related Questions

- Physics - Two bullets have masses of 4.6 g and 11 g, respectively. Each is fired...
- PHYSICS - Two bullets have masses of 3.4 g and 8.1 g, respectively. Each is ...
- PHYSICS - Two bullets have masses of 3.4 g and 8.1 g, respectively. Each is ...
- MATH - A track meet awards 6, 5, 4, 3, 2 and 1 points for 1st, 2nd, 3rd, 4th, ...
- Calculus - ﬁnd the ﬁrst three non-zero terms of the Maclaurin ...
- physics - The initial kinetic energy imparted to a 0.72 kg bullet is 1777 J. The...
- physics - One strategy in a snowball ﬁght is to throw a snowball at a ...
- Physics-Kinetic energy - Two 2.0 g bullets are fired with speeds of 40.0 m/s and...
- Maths (Trigonometry) - Raylene who was involved in an orienteering competition. ...
- Physics(checking answer) - Two 3.0g bullets are fired with speeds of 40.0 m/s ...

More Related Questions