Question

a stone is dropped from the edge of roof how long does it take to how fast does it move to at the end of falls ​

Answer 1

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.