This document discusses the conservation of mechanical energy and different types of potential and kinetic energy. It provides examples of how to calculate changes in speed using the principle of conservation of energy for situations involving gravitational potential energy, elastic potential energy, and kinetic energy such as a rollercoaster, pendulum, and hot dog cart passing over two hills. The key steps shown are identifying the relevant energies, setting the initial and final energies equal to each other, and solving the resulting equation to find the unknown speed or height.
68. Example Problem:
A 300 kg Hotdog cart rolls up and
down a street. It passes the top of
hill A. Which is 50m high at a
speed of 8 meters per second.
How fast is the hot dog cart going
to pass the next hill (B) which is
30m high?
69. Example Problem:
1: cart rolls up and
ep
A 300 kg Hotdog
t
S
down a street. It passes the top of
hill A. Which is 50m high at a
speed of 8 meters per second.
How fast is the hot dog cart going
to pass the next hill (B) which is
30m high?
70. Example Problem:
A 300 kg Hotdog cart rolls up and
down a street. It passes the top of
hill A. Which is 50m high at a
speed of 8 meters per second.
How fast is the hot dog cart going
to pass the next hill (B) which is
30m high?