Calculating m2: Spheres Collision Equation | Homework Help"

[rayven18]

Homework Statement

Two spheres S1 and S2 are moving towards each other. Let's say that the balls are the "O" letter

O--> <--O Where m1=0.15kg and u1=4m/s and m2=; and u2=2m/s. After the hit each other they will go like this
<--O O--> Where m1=0.15kg u1'=12m/s and m2=; u2'=10m/s
Find the m2

Homework Equations

The Attempt at a Solution

I did the following and i think it is correct.

m1*u1-u2=m1*u1'+u2'*v (v is the value m2 we are searching for)
0.15*4-2=-0.15*12+10*v
0.60-2=-1.8+10*v
0.4=10*v
10 10

v=0,04kg

Is this correct?

 

[Delphi51]

0.15*4-2=-0.15*12+10*v

Missing the m2 just before the equal sign.
Each term in the momentum equation must be an m*v or m*u.
Easier to see that if you use m instead of v for mass.

 

[rayven18]

Yes i know. My bad. I asked my teacher and it should be like that 0.60+1.8=2+10*v and then do 2.4/12 and we get 0.2. Thanks for the reply though. TOPIC CLOSED