# physics

A 3.1-kilogram gun initially at rest is free to move. When a 0.015-kilogram bullet leaves the gun with a speed of 500. meters per second, what is the speed of the gun?

1. 👍 0
2. 👎 0
3. 👁 1,352
1. This a chance for you to apply the law of conservation of momentum.

That means the momentum of the gun going backward is equal and opposite to the momentum of the bullet going forward. The two momenta cancel out.

Mbullet*Vbullet = -Mgun*Vgun

Solve for Vgun

1. 👍 0
2. 👎 0
posted by drwls
2. 7.5 m/s

1. 👍 0
2. 👎 6
3. pbefore=pafter
m1v1+m2v2 = m1v’1+m2v’2
(3.1kg)(0m/s)+(0.015kg)(0m/s) =
(3.1kg)( v’1)+(0.015kg)(500.m/s)
0kg∙m/s=(3.1kg)( v’1)+7.5kg∙m/s
-7.5kg∙m/s=(3.1kg)( v’1)
v’1=-2.4m/s (its speed is 2.4 m/s)

1. 👍 2
2. 👎 0
4. u=0
0+0= 3.1 v1 + 0.015(500)m/s
-3.1v1= 7.5
v1= 7.5:(-3.1)

V1=-2.42 in absolute value then the answer will be 2.42

1. 👍 1
2. 👎 0
5. u=0
0+0=3.1V+ 0.015(500)M/S
-3.1V = 7.5
V= -2.42M/S OR 2.42m/s in absolute value

1. 👍 1
2. 👎 0
posted by agahozo
6. Stephanie is a troll

1. 👍 0
2. 👎 0
posted by h

## Similar Questions

1. ### physics

a 2 kilogram rifle initially at rest fires a 0.002 kilogram bullet. as the bullet leaves the rifle with a velocity of 500 meters per second, what is the momentum of the rifle bullet system? isn't the answer one because final

asked by john on January 6, 2011
2. ### Physics

A 5 gram bullet is fired horizontally and hits an 8 kilogram block of wood (initially at rest) which can move freely. The wood and the bullet move with a velocity of 0.50 m/s after impact. What is the initial velocity of the

asked by Angel on March 14, 2017
3. ### Physics

Blocks with masses of 1 kilogram, kilogram, and 3 kilogram are lined up in a row on a frictionless table. All three are pushed forward by a 12 Newton Force applied to the 1 kilogram block. Draw a free body diagram of all 3 blocks.

asked by Anonymous on November 9, 2016
4. ### Physics

A 4-kilogram mass has a speed of 6 m/s on a horizontal frictionless surface. The mass collides head-on and elastically with an identical 4-kilogram mass initially at rest. The second 4-kilogram mass then collides head-on and

asked by Hannah on January 17, 2008
5. ### Physics

A 10 kilogram block initially hangs at rest at the end of two 10 meter strings of negligible mass as shown on the left diagram above. A 0.009 kilogram bullet, moving horizontally with a speed of 1600 meters per second, strikes the

asked by jill on November 27, 2011
6. ### Physics

1) A 10 kg car is moving at 44 m/s when it collides with a stationary 71 kg truck. The two cars interlock and move off at what speed 2) A 9 kilogram potato leaves a 155 kilogram cannon with a velocity of 283 m/s. What is the

asked by Lilth on June 4, 2018
7. ### Physics

a 4 kilogram ball moving at 8 meters per second to the right collides with a 1 kilogram ball at rest. After the collision, the 4 kilogram ball moves at 4.8 meters per second to the right. What is the velocity of the 1 kilogram

asked by Hellen on March 27, 2012
8. ### math

A store mixes Brazilian coffee worth \$11 per Kilogram, Turkish coffee worth \$13 per kilogram. The mixture is to sell for \$12 per kilogram. Can you help me find how much of each should be used to make a 564- Kilogram of both

asked by Mandy on December 8, 2011
9. ### algebra

A store mixes kenyan coffee worht \$12 per kilogram and turkish coffee worth \$16 per kilogram the mixture is to sell for \$14 per kilogram how much of each should be used to make a 348-kilogram mixture?

asked by ana on March 18, 2013
10. ### Physics

What is the momentum of a 1.5 × 103 kilogram van that is moving at a velocity of 32 meters/second? A. 46.9 kilogram meters/second B. 4.7 × 103 kilogram meters/second C. 4.85 × 102 kilogram meters/second D. 4.85 × 104 kilogram

asked by fredrick on March 13, 2013

More Similar Questions