<u>Answer:</u> 3
H = 45 m ,
time required for the stone
S = u.t+(1/2) g.t²
45 = (1/2) 9.81. t² since u( initial velocity) = 0 ; S =H.
t² = 9.17 s
<em> t = 3.02 s </em>
therefore answer is 3 m/s
<em> if you satisfy with explanation, please give brainiest ; </em>
Material medium electric waves
Id say d because it releases hydrogen and on the other hand a base receives it
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Animals have a food chain. (sorry for my bad English)
