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Galileo dropped objects from the Tower of Pisa to study gravity

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.

Solution Preview

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

56 - 36.4 = 19.6 ...

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