# physics

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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?
. J
(b) The rock falls from the cliff. What is its kinetic energy just before it strikes the ground?
J

• physics -

(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)

• physics -

we don't have textbooks, and my teacher dosent teach, he just gives us really hard homework:(

• physics -

Yeah! Right!

• physics -

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.

• physics -

A 20 kg rock is at the edge of a cliff 100 m above the ground. What is the potential energy of the rock?

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