Physics

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Jo student undertakes a unique experiment with his calculator. He goes to the school roof that is 18.0 m above the ground. He throws the poor calculator upward with a velocity of 42 m/s. Assume that the calculator goes straight up and just misses the roof on its way to the ground.

Calculate the velocity with which the calculator will hit the ground.

• Physics -

For an easy solution, use conservation of energy.
Vo = 42 m/s
Vf = final velocity
M ='mass
H ='rooftop height

MgH + (M/2)Vo^2 = (M/2)Vf^2

Cancel out the M and solve for Vf

Vf^2 = Vo^2 + 2 g H

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