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A pebble is dropped from the top of a 144-foot building. The height of the pebble h after t seconds is given by the equation h=−16t2+144 . How long after the pebble is dropped will it hit the ground?
Interpretation
a) Which variable represents the height of the pebble, and in what units?
b) Which variable represents the time in the air, and in what units?
c) What equation relates the height of the object to its time in the air?
d) What type of equation is this?
e) What are you asked to determine?
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Why will a water balloon dropped from six feet make a bigger splat than a water balloon dropped from 1 foot?
6 feet
What are the examples of rules in rounding numbers?
If the number to be dropped is less than 5, the number before it remains unchanged. Round the following number, so that the 4 is to be dropped. 2.6354 rounds to 2.635. If the number to be dropped is greater than 5, the number before it is rounded up. Round the following number, so that the 6 is to be dropped. 9.4046 rounds to 9.405. If the number to be dropped is 5, the number before it remains the same if it is an even number and is rounded up if it is an odd number. 2.685 rounds to 2.68 because 8 is an even number. 7.3075 rounds to 7.308 because 7 is an odd number.
How long will it take an object dropped from a window to fall a distance of 78.4 meters?
4 Seconds
A rock dropped down a well takes 3 seconds to fall to the bottom of the well What is the depth of the well?
45
Is the 5 second rule real?
No, it only takes three seconds for salmonella and E-coli to contaminate dropped food.
