Posted by **cat21** on Tuesday, August 9, 2011 at 9:44pm.

A 40 g marble moving at 2.3 m/s strikes a 29 g marble at rest. Assume the collision is perfectly elastic and the marbles collide head-on. What is the speed of the first marble immediately after the collision? What is the speed of the second marble immediately after the collision?

How do you set this up?

- Physics -
**bobpursley**, Tuesday, August 9, 2011 at 10:20pm
two equations: Conservation of momentum

M1V1+m2(0)=M1V1' + m2V2'

solve for v2' in terms of all others.

second equation: conservation of energy

M1V1^2+0=M1V1'^2 + m2V2'^2

put the v2' equation into that equation, and solve for v1'

A bit of algebra is required, get a pad of paper.

- Dont get it? -
**cat21**, Wednesday, August 10, 2011 at 9:37pm
I tried plugging the number in and it didnt work...where are the numbers supposed to be placed in the first equation?

## Answer this Question

## Related Questions

Physics - A 40 g marble moving at 2.3 m/s strikes a 29 g marble at rest. Assume ...

physics - A 40 g marble moving at 2.3 m/s strikes a 29 g marble at rest. Assume ...

Physics - A 49.0 g marble moving at 2.20 m/s strikes a 22.0 g marble at rest. ...

physics please help - a 10.0-g marble rolls to the left with a velocity of ...

physics - A 25.1 g marble moving to the right at 22.9 cm/s overtakes and ...

Physics - A 26.3 g marble sliding to the right at 21.0 cm/s overtakes and ...

Physics - A 26.3 g marble sliding to the right at 21.0 cm/s overtakes and ...

physics - A 24.0 g marble sliding to the right at 60.8 cm/s overtakes and ...

Physics - A 26.2 g marble sliding to the right at 62.0 cm/s overtakes and ...

Physics - A 20.0 g marble sliding to the right at 58.8 cm/s overtakes and ...