A hoodlum throws a stone vertically downward with an initialspeed v 0 from the r

Question

A hoodlum throws a stone vertically downward with an initialspeed v0 from the roof of a building, a heighth above the ground. (a) How long does ittake the stone to reach the ground? (b) What isthe speed of the stone at impact? Give your answers in terms of thegiven variables and g. (a)t =??? (b)v =??? A hoodlum throws a stone vertically downward with an initialspeed v0 from the roof of a building, a heighth above the ground. (a) How long does ittake the stone to reach the ground? (b) What isthe speed of the stone at impact? Give your answers in terms of thegiven variables and g. (a)t =??? (b)v =???

Explanation / Answer

     Given that the initial velocity isvo        Height is h --------------------------------------------------- From the equation of motion V2 - vo2 =2gh                                                       V = (vo2 + 2gh)1/2          this is final velocity of bodyjust before strike the ground From the equation of motion   V = vo + gt                                                t = ( V - vo ) /g                                            (or)    From the equation of motion S = ut + (1/2)at2                                             h = vo*t +(1/2)gt2            slovefor t =-------sec

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