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Galileo dropped objects from the Tower of Pisa to study gravity

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1. Galileo dropped objects from the Tower of Pisa to study gravity. The objects height above the ground could be measured using h=-4.9t^2 +56.

a) How high is the Tower?
56 units

b) How far has an object fallen after 2 seconds?

h = -4.9^2 + 56
h = -4.9(2)^2 +56
h = -19.6 +56
h= 36.4 units

c) How long will it take for an object to hit the ground?

h = -4.9^2 + 56
0 = -4.9t^2 + 56
4.9t^2 = 56 - 0

I do not know where to go from here.

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Solution Summary

The expert examines Galileo dropped objects from the Tower of Pisa to study gravity

Solution Preview

a) correct.
b) h=36.4 units therefore the object has fallen:

56 - 36.4 = 19.6 ...

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