- #1
DeltaForce
- 38
- 6
Homework Statement
A 4-kg block moving at 7m/s makes a head-on collision with a stationary block of mass 3kg. Find the velocities of the two blocks after the collision.
m1=4kg, vi1=7m/s
m2=3kg, vi2 = 0m/s
Trying to find vf1 and vf2
2. Homework Equations
Using the conservation of momentum formula.
m1(vi1)+m2(vi2) = m1(vf1)+m2(vf2)
3. The Attempt at a Solution
Plugging in the numbers I get: 4(7)+3(0) = 4(vf1)+3(vf2)
28 = 4(vf1)+3(vf2)
It is at this point where I'm stuck. How do I find vf1 and vf2? I feel like I'm missing something.