# Speed of moving object

• Jan 15th 2008, 04:23 PM
dumplings
Speed of moving object
Please walk me through:

The height s (in feet) of an object fored strait up from ground level with an initial velocity of 120 feet per second is given by s = -16t^2 + 150t, where t is time in seconds. How fast is teh object moving after 5 seconds?
• Jan 15th 2008, 04:39 PM
topsquark
Quote:

Originally Posted by dumplings
Please walk me through:

The height s (in feet) of an object fored strait up from ground level with an initial velocity of 120 feet per second is given by s = -16t^2 + 150t, where t is time in seconds. How fast is teh object moving after 5 seconds?

Is this a Calculus question?

Then the velocity function is
$v = \frac{ds}{dt} = -32t + 150$

-Dan