- #1
KatieLynn
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Homework Statement
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?
Homework Equations
F=m(Vf-Vi)/t
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.