Why Does My Quadratic Equation Not Solve in This Momentum Problem?

[nehcrow]

Homework Statement

See attached image

Homework Equations

Momentum equations.
Kinetic energy equations.

The Attempt at a Solution

I attempted to write out the momentum equation and the kinetic energy equation and tried to resolve the two equations (which became a quadratic) but I keep getting a false equation from my calculator

m*u = m1*v1 + m2*v2
Ek = 1/2*m1*v1^2 + 1/2*m2*v2^2

I substituted the values in and it resulted in a unsolvable quadratic equation.
Any tips guys?

 

[Quinzio]

What did you put in this value ?
m*u

 

[nehcrow]

m*u = 54.77