Just before striking the ground

PHYSICS · Subjective · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

Just before striking the ground, a stone has a downward speed of

25\,\text{m/s}

after falling vertically through

30\,\text{m}

. Taking

g=9.8\,\text{m/s}^2

downward, determine the stone’s initial speed when it began its fall.

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