# Homework Help: Impact, particle kinetics

1. May 2, 2010

### red123

1. The problem statement, all variables and given/known data

A 4-kg projectile travels with a horizontal velocity of 600 m/s before it explodes and breaks into two fragments A and B of mass 1.5 kg and 2.5 kg, respectively. If the fragments travel along the parabolic trajectories shown, determine the magnitude of velocity of each fragment just after the explosion and the horizontal distance dA where segment A strikes the ground at C.

2. Relevant equations

mAVA1x + mBVB1x = mAVA2x + mBVB2x

3. The attempt at a solution

(1.5 kg)(600 m/s) + (2.5 kg)(600 m/s) = (1.5 kg) VA2cos(45) + (2.5 kg) VB2cos(30)

2400 kg m/s = (1.5cos(45) kg) VA2 + (2.5cos(30) kg) VB2

Solving two unknowns?

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Last edited: May 2, 2010
2. May 2, 2010

### willem2

If you have 2 equations that are both derived from a third one, they aren't independent. So you're stil one equation short. Try conservation of momentum in the vertical direction.