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## Homework Statement

A 3.55 kg object sliding on a frictionless surface breaks into two masses that are both equal to half of the original mass. The velocities of the masses are 3.26 m/s due north and 4.58 m/s, 25.4° north of east. Determine the original speed of the 3.55 kg mass.

## Homework Equations

p = mv

Ek = 1/2 mv^2 But this isn't an elastic collision, so the conservation of energy wouldn't work

## The Attempt at a Solution

Momentum is conserved.

(I'm assuming the mass is moving in a horizontal direction)

m1x v1x = m2x v2x cos(theta)

(3.55)(v1x) = (3.55/2)(4.58)(cos 25.4)

2(v1x) = (4.58)(cos25.4)

v1x = 2.07 m/s

Erm... I resolved it in terms of the x direction so I'm not sure why it isn't working...