Question

a stone id droped from the edge of a roof how fast does it move at the end of the fall​

Answer 1

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If a stone is falling freely in gravitational field of earth then it will expiernce acceleration of g = 9.8 m/s2.

Answer: From h = 1/2gt^2 , where intial velocity is zero,

put g = 9.8m/sec^2,

and h = 4.9 m

as per your question, you get the value of

t=1 sec

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Answer 2

Answer:

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If a stone is falling freely in gravitational field of earth then it will expiernce acceleration of g = 9.8 m/s2. Answer: From h = 1/2gt^2 , where intial velocity is zero, put g = 9.8m/sec^2, and h = 4.9 m as per your question, you get the value of t=1 sec