(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Marble A, mass 5g moves at a speed of 20 cm/s. It collides with a second marble B, mass 10 g, moving at 10 cm/s in the same direction. After the collision, marble A continues with a speed of 8 cm/s in the same direction. A) Calculate the momentum of each marble before the collision. B) Calculate the momentum of each marble after the collision. C) What is the speed of marble B after the collision?

2. Relevant equations

F=m(Vf-Vi)/t

3. The attempt at a solution

I converted all the numbers first

Mass A= .005kg

Vi A = .2 m/s

Mass B= .1 m/s

Vi B = .2 m/s

V after = .8 m/s

A) Marble A:

(.005kg)(02m/s) = .001 kg*m/s

Marble B:

(.01kg)(.1m/s)=.001 kg*m/s

B) (.001+.001)=(.005kg+.01kg)V

v=1.33 m/s

What did I do wrong in B? I'm pretty sure A is right.

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# Homework Help: Marble collisions, momentum, velocity

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