Verizon LTE 9:41 PM 4096 [-+ Part A A small rock is thrown vertsically upward wi

Question

Verizon LTE 9:41 PM 4096 [-+ Part A A small rock is thrown vertsically upward with a speed of 21.0 m/s from the edge of the roof of a 29.0-m-tal building. The rock doesnt hill the building on ts way back down and lands in the street below Ignore air resistance hits the What the speed ofthe rock just before street? Express your answer with the appropriate HA Valu Units My Answers Give Up Part B How much trne elapses from when therock thrown until it hits the street? Express your answer with the appropriate Value Units My Answers Give Up

Explanation / Answer

a)

Vo = initial velocity of rock = 21 m/s

Vf = final velocity just before landing = ?

a = acceleration = - 9.8 m/s2

Y = vertical displacement = height of building = - 29 m

using the equation

Vf2 = Vo2 + 2 a Y

Vf2 = (21)2 + 2 (- 9.8) (- 29)

Vf = 31.8 m/s

b)

using the equation

Y = Vo t + (0.5) a t2

- 29 = 21 t + (0.5) (-9.8) t2

t = 5.4 sec

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