Posted by **lily** on Thursday, February 14, 2013 at 8:28pm.

The formula for the height of a falling object is shown below, where h is the height of the object in meters, t is the time in seconds, and k is the height, in meters, from which the object began its fall.

h = –4.9t² + k

If a rock is dropped from a building that is 150 meters tall, what is the height of the rock 4 seconds after it was dropped?

- algebra 1 -
**PsyDAG**, Thursday, February 14, 2013 at 8:43pm
h = -4.9(4)^2 + 150 = ?

- algebra 1 -
**lily**, Friday, February 15, 2013 at 10:25am
is it 145.1

- algebra 1 -
**lily**, Friday, February 15, 2013 at 10:30am
not it is 71.6 right

- algebra 1 -
**PsyDAG**, Friday, February 15, 2013 at 6:52pm
Right!

- algebra 1 -
**Anonymous**, Friday, July 25, 2014 at 10:11am
if an object is dropped from a great height, its speed "v" varies directly with the time "t" it has been falling . a rock dropped over the edge of a canyon is traveling 39.2 m/s after 4 sec.

1. Express v as a function of t.

2. what is the speed of the rock after 9 seconds

- algebra 1 -
**Anonymous**, Thursday, April 16, 2015 at 9:09pm
Falling Object An object is dropped from a

height of 576 feet. How long does it take for

the object to reach the ground? Assume there

is no air resistance

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