I am trying to calculate the force of a 36,000kg truck traveling with a constant velocity of 26.8224 m/s colliding with a 62kg person who is standing still (0 m/s velocity). I know that ∑F=0 ∴ Ftruck→person=-Fperson→truck, that F=ma, and a=v/t. But this would be instantaneous and as I recall that would make it important to calculate impulse and/or momentum. I know that momentum is p=mv and impulse is J=Δp. This should be easy as I have done plenty of these kinds of problems in school, but right now I seem to be brain farting all this. I can't seem to relate the given terms and the unknowns to solve for F. :s I'm trying to use it in an example for someone else so I can relate the amount of force exerted on an object in LEO to something like getting hit by a truck. Right now I have the gravitational force exerted by the Earth on the ISS being 7.94072 × 10^8 N. I want to tell them "that is like being hit by [x amount] of trucks."