Impact force equals mass times velocity.
I don’t think calculating it is as simple as multiplying pounds times mph, as the author appears to have done.
This formula is the reason relatively low-mass objects, such as bullets, can do massive damage when traveling at high enough speed.
m * v is momentum
force is m * a
and the problem is energy dissipations which used to go as 1/2 m*v^2
The force is one half the mass times the square of the velocity, so doubling the speed quadruples the force of the impact.
No, that is momentum. Momentum is not force. Again, see post #28. The key thing is change in speed divided by time.