Calculating Falling Objects: GPE, KE and Speed

[Ravious]

I have some questions which I don't understand.

Assume that all questions take place chose to surface of earth
gravity = 10n/kg

1) a 57g tennis ball is dropped from a height of 90cm

a) What is the gravitational potential energy of the tennis ball before it is dropped?
b) What is the kinetic energy of the ball as it lands?
c) What is the vertical speed of the ball as it lands on the ground?

Help of any kind would be appreciated

 

[SteamKing]

First, in order to receive help, you must show some effort at solving your problem.

Second, there are key terms in the OP which you can look up or should have some notes on, like 'potential energy', 'kinetic energy', and 'vertical speed' of falling objects.

 

[Yosty22]

As SteamKing pointed out, you have to show us how you approached the problem that led you astray. We will not just give you the answer. We can point you in the correct direction, though. Is there anything that you tried to do? If so, show us your work and we can see where you may have gone wrong.