# physics

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?

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1. (a) K = 1/2 mv^2 - you have the numbers. plug 'em in

(b) PE = KE

(c) s = v^2/2a

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2. WHAT does "a" stand for?

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3. pefvghfh

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