SOLUTION: An object is propelled vertically upward with an initial velocity of 20 meters per second. The distance s (in meters) of object from ground after t seconds is s=-4.9t( squared) +20

Question 986856: An object is propelled vertically upward with an initial velocity of 20 meters per second. The distance s (in meters) of object from ground after t seconds is s=-4.9t( squared) +20t. When will object be 15 meters above ground?
Is this set up like 15=-4.9tsquared+20t??
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
An object is propelled vertically upward with an initial velocity of 20 meters per second. The distance s (in meters) of object from ground after t seconds is s=-4.9t( squared) +20t. When will object be 15 meters above ground?
Is this set up like 15=-4.9tsquared+20t??
--------------
Yes, exactly like that.
Solve for t.
There might be 2 values for t, 1 going up, another descending.
RELATED QUESTIONS
An object is propelled vertically upward with an initial velocity of 20 meters per... (answered by stanbon)

An object is propelled vertically upward with an initial velocity of 20 meters per... (answered by nerdybill)

An object is propelled vertically upward with an initial velocity of 20 m/s. The distance (answered by Alan3354,ikleyn)

An object is propelled vertically upward with an initial velocity of 20 meters per... (answered by ikleyn,math_tutor2020)

An object is propelled vertically upward with an initial velocity of 20 meters per... (answered by ikleyn)

An object is propelled vertically upward from the ground with an initial velocity of 35... (answered by ikleyn)

An object is propelled upward from 12 meters above ground with an initial velocity of 120 (answered by ikleyn,Alan3354)

1. two cars enter a Florida Turnpike at 8:00am, each heading for Wildwood. one car... (answered by ankor@dixie-net.com)

The formula h=-16t^2+vt gives the height h in meters of an object after t second, when it (answered by ankor@dixie-net.com)