dpchampion3054 dpchampion3054

23-06-2017
Physics

contestada

A hoodlum throws a stone vertically downward with an initial speed of 12.0 m/s from the roof of a building,30.0 m above the ground. (a) how long does it take the stone to reach the ground

Respuesta :

Tharindu Tharindu

23-06-2017

s=ut +1/2at2
30=12t+1/2*10*t2
5t2+12t-30=0

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