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You are on the roof of the physics building, 46 m above the ground. Your physics professor, who is 1.80 m tall, is walking alongside the building at a constant speed of 1.20 m/s. If you wish to drop an egg on your professor’s head, where should the professor be when you release the egg? Assume that the egg is in free fall.

Question

You are on the roof of the physics building, 46 m above the ground. Your physics professor, who is 1.80 m tall, is walking alongside the building at a constant speed of 1.20 m/s. If you wish to drop an egg on your professor’s head, where should the professor be when you release the egg? Assume that the egg is in free fall.

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Step 1

The kinematic equation for finding the displacement is

1
s ut
2
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1 s ut 2

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Step 2

The displacement is the difference between the height of the building and the professor.

[2]
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[2]

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Step 3

Use the equation (2) in (1)...

gt°
2(h-h)
t =
2(46m -1.80m)
9.8m/s2
=3.003s
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gt° 2(h-h) t = 2(46m -1.80m) 9.8m/s2 =3.003s

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Physics

Kinematics

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