posted by Brianna on .
A 17-kg rock is on the edge of a 103-m cliff.
(a) What potential energy does the rock possess relative to the base of the cliff?
(b) The rock falls from the cliff. What is its kinetic energy just before it strikes the ground?
(a) Surely your text material incudes the formula for gravitational potential energy. Use it.
(b) The kinetic energy increase at the bottom equals the potential energy calculated in part (a)
we don't have textbooks, and my teacher dosent teach, he just gives us really hard homework:(
a) mass*gravity*height= gravitational potential energy.
17*103*9.8= x Joules
b) as the object falls the potential energy is converted to kinetic. so just before it hits the ground all of the potential energy has become kinetic.
A 20 kg rock is at the edge of a cliff 100 m above the ground. What is the potential energy of the rock?