A brick is dropped from the top of a building through the air (friction is present) to the ground below.
How does the brick's kinetic energy (K) just before striking the ground compare with the gravitational potential energy (U_{grav}) at the top of the building? Set y=0at the ground level.
A. K is equal to U_{grav}.
B. K is greater than U_{grav}.
C. K is less than U_{grav}