Homework Help: physics

Posted by sim on Friday, December 9, 2011 at 1:32pm.

a ball has a mass of 0.5kg dropped from a cliff top, the ball srtikes the sea below at a velocity of 10m/s.
(a)what is the kinetic energy of the ball as it strikes the sea?
(b) what was its potential energy before it was dropped?
(c)from what height was it dropped?

physics - Steve, Friday, December 9, 2011 at 2:51pm
(a) K = 1/2 mv^2 - you have the numbers. plug 'em in

(b) PE = KE

(c) s = v^2/2a
physics - sim, Friday, December 9, 2011 at 3:01pm
WHAT does "a" stand for?

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