Posted by **lisa** on Monday, July 8, 2013 at 1:49pm.

wo identical rubber balls are dropped from different heights. Ball 1 is dropped from a height of 100 feet, and ball 2 is dropped from a height of 210 feet. Write a function for the height of each ball.

h1(t) =

h2(t) =

When does ball 1 reach the ground? Round to the nearest hundredth. _____seconds

When does ball 2 reach the ground? Round to the nearest hundredth. _____seconds

- algebra1 HELP PLEASE Thanks you!! -
**Reiny**, Monday, July 8, 2013 at 2:17pm
h1(t) = -16t^2 + 100

h2(t) = -16t^2 + 210

when ball 1 reaches ground, h1(t) = 0

16t^2 = 100

t^2 = 100/16

t = √(100/16) = 10/4 = 5/2 seconds

do the 2nd the same way

- Steve and Ms Sue -
**Reiny**, Monday, July 8, 2013 at 2:29pm
Had no idea that Lisa had asked this question several times before and had shown no sign of effort.

(I started answering top down)

- Reiny -
**Steve**, Monday, July 8, 2013 at 2:33pm
Oh well.

If her guile and persistence have helped her learn the material, it has worked out ok.

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