I apologise in advance if this should be somewhere else, but here goes anyways.
Me and a friend are making a film and at one point someone jumps off a bridge and onto a boat (but in the filming they will jump straight into the water). What I need to know is, will this hurt our actor? We hope to do the stunt twice (to make sure we have sufficient shots). First time round they will be jumping straight into the water. Second time around, we will be having a green screen on the water.
I have been able to work out a few things already using simple F=MA and Suvat, but these don't really include real world things like air resistance and such.
A few bits of info which I'm sure will help;
Actors weight 65kg
Bridge Height 4m
Density of Water 1000kg/m^3
The Green screen will not be fixed just held in place lightly which will easily pull away once the actor lands on the screen.
Many Thanks in Advance