- #1
student34
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Homework Statement
A 110 kg football player runs at 2.75 m/s directly into a 125 kg player running 2.60 m/s towards him. What is the kinetic energy of the two players if this is a completely inelastic collision.
Homework Equations
P = m*v
Ptotal = Pi - Pf
K = 0.5*m*v^2
The Attempt at a Solution
Ptotal = 110kg*2.75m/s - 125kg*2.60m/s = -22.5kgm/s
k = 0.5*(125kg +110kg)*((-22.5kgm/s)/235kg)^2 = 1.07 J
But my textbook's answer is 838 J. I just cannot see where I am wrong.