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 March 5th, 2017, 08:55 PM #1 Senior Member   Joined: Jan 2017 From: US Posts: 120 Thanks: 6 Algebra Velocity Problem An object is thrown from an initial height of 0 feet with an initial velocity of 160 feet per second. Solve for when it will return to the ground. Show your work and explain the steps you used to solve.
 March 5th, 2017, 08:59 PM #2 Senior Member     Joined: Sep 2015 From: USA Posts: 2,505 Thanks: 1374 Since its starting and ending altitudes are the same, 0 feet, the time it returns to the ground is twice that of when it reaches the top of its trajectory. At the top of its trajectory, its vertical speed is 0 ft/s. That should get you started. Thanks from Indigo28 Last edited by skipjack; March 7th, 2017 at 12:13 PM.
March 7th, 2017, 10:08 AM   #3
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Quote:
 Originally Posted by Indigo28 An object is thrown from an initial height of 0 feet with an initial velocity of 160 feet per second. Solve for when it will return to the ground. Show your work and explain the steps you used to solve.
It would be better for you to "show your work and explain the steps you used"! Are you given the formula "s= (a/2)t^2+ (v0)t+ s0" (v0 is the initial speed, s0 is the initial height)? The only other way I can think of would
use Calculus.

In this problem v0= 160 and s0= 0 while a is the downward acceleration is 32 feet per second per second. S+ o it will return to the ground when (-32/2)t^2+ 160t= 0. That equation should be easy to solve. It has two solutions but it should be clear which is the one you want!

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