Urgent Help

[Nicholasw]

What formula would I use to solve for a and b?

A 0.20-kg ball is held at rest 2.2 m above the ground, and then it is dropped. Apply the law of conservation of energy to determine the ball's speed after it has fallen (a) 1.1 m and (b) 2.2 m. Ignore air resistance.

Answers
(a) 4.6 m/s
(b) 6.6 m/s

So How would I get these answers?

Thanks

[Chi Meson]

You use two formulas; the one ofr gravitational potential energy and the one for kinetic energy.

[zanazzi78]

have a look at this thread (http://www.physicsforums.com/showthread.php?t=98314)

[Nicholasw]

Okay Thanks. I will do that