Question

KE=1/2MVV

Not sure how to put velocity squared in a forum. It is kenetic energy is equal to one half mass times velocity squared. Velocity in feet per second, Convert the grains to pounds then mass (as Olevey did above), for ft/lbs of energy.

Acceleration of gravity is actually 32.2 feet per second squared, as the gravitational acceleration increases instrumentally until reaching terminal velocity. You can use this in kinematic equasions to determine velocity anywhere along a path.