# Homework Help: Average velocity during impact

1. Nov 10, 2005

### Atilla1982

A boy with a weight of 70 kg jumps down from a 3 meter high tree. His velocity on impact I have found to be 7,68 m/s and the impulse is 536,7kg*m/s. Now I need to find the average velocity during impact. What formula do I have to use?

2. Nov 10, 2005

### Päällikkö

What's the definition of average velocity?

3. Nov 10, 2005

### BerryBoy

I suppose, if acceleration is constant, then:

vave. = (v1 + v0)/2

An important point I'd like to raise here:

Weight is a force, therefore it has the units of Newtons. Obviously the man doesn't have a mass of 7kg so I can only assume the his weight is 700N (with g = 10ms-2).

Regards,
Sam