- #1
BrainMan
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Homework Statement
A ball of mass = 3-kg moving to the right at 3 m/s collides elastically with a ball of mass m2 = 2 kg moving at 4 m/s to the left. Find (a) the final speed of each object and (b)
the kinetic energy of each ball before and after the collisions.
Homework Equations
V1i + V1f = V2f + V2i
V1i - V2i = - (V1f - V2f)
The Attempt at a Solution
I plugged the numbers into the above formulas
3 + V1f = -4 + V2f
V2f = 7 + V1f
3 - (-4) = -(V1f - V2f)
7 = -V1f + V2f
substitute V2f
7 = -V1f + 7 + V1f
I got 0 = 0 the answer should be V1f = -2.60 ms, V2f = 4.40 m/s