Question

10) A ball falls from the top of the Empire State Building, through the air (air friction is present), to the ground below. How does itskinetic energy (K) just before striking the ground compare to its potential energy (U) at the top of the building?Select one:A. It is impossible to tell.B. Kis equal to U.2C. Kis greater than U.D. K is less than U.

Answer 1

kinetic energy = 1/2* m* v^2

Potential energy = m*g*h

Where:

m= mass

g= acceleration due to gravity

h= height

v= velocity

on the top of the building:

K = max ( max height)

U= 0 (no velocity)

Before striking the ground:

k= gets lower ( less h)

U= higher ( it has velocity)

Answer

D. K is less than U.​