Frank sells hot dogs at the top of Nob Hill, 50 meters above sea level. Frank's 300 kilogram hot dog cart rolls down Nob Hill to sea level and
then up the next hill, which is 30 meters above sea level.

a. Calculate potential energy at the top of Nob Hill.

b. What is the kinetic energy at the top of Nob Hill?

c. What is the total mechanical energy at the top of Nob Hill?

d. Calculate potential energy at the bottom of Nob Hill.

e. What is the kinetic energy at the bottom of Nob Hill?

f. What is the total mechanical energy at the bottom of Nob Hill?

g. Calculate potential energy at the top of the second hill.

h. What is the kinetic energy at the top of the second hill?

1. What is the total mechanical energy at the top of the second hill?

J. Calculate the velocity at the top of the second hill.