Help please!!?

you are on roller blades on top of a large hill. Your potential energy is equal to 1000 joules. The last time you checked your mass was 60kg.


a. what is your weight in newtons?


b. what is the height of the hill?


c. if you start skating down this hill, your potential energy will be converted to kinetic energy. At the bottom of the hill, your kinetic energy will be equal to your potential energy at the top. What will be your speed at the bottom of the hill?





2.A 1kg ball is thrown into the air with an initial velocity of 30 m/s. How much kinetic energy does the ball have?


b. how much potential energy does the ball have when it reaches the top of its ascent?


c. how high into the air did the ball travel?

Help please!!?
Hints


1a F=MA


A is just g


force is your weight





1b Energy = force times displacement


displacement is height of hill





1c KE = 1/2 MV^2 rearrange to V = SQR[2KE/M]





2a 1/2 MV^2


2b Since it stops at the top it has no KE. Since energy is conserved, KE converted to PE


2c see 1b



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