If a rock has a speed of 12 m/s as it hits the ground, from what height did it fall, assuming its initial speed was zero?

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Its mass is 50 kg.

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Answer 1 · 2018-04-11T12:56:35

To find the height the following formula should be used: #v^2 = u^2 + 2aH#

Assuming this occurs on earth, #a = 9.8# #ms^-2#

#12^2 = 0^2 + 2 xx 9.8 xxH#

#144/(2 xx 9.8) = H#

#H = 7.35# #m#