Momentum conservation in collisions

1. Oct 12, 2009

ba726

can the percentage error for final total momentum be negative in an elastic collision? It doesn't have absolute value in the equation given and I get a negative number, p(final) - p(initial)/p(initial) x 100 though small -0.528

2. Oct 12, 2009

Staff: Mentor

Hi ba726, welcome to PF. Yes, errors can be negative.