word problem for mathematics

Mathematics
Tutor: None Selected Time limit: 1 Day

May 20th, 2015

h= -4.9t^2+18.9t+2.8

2.8= -4.9t^2+18.9t+2.8

4.9t^2-18.9t=0

t(4.9t-18.9)=0

t=or

4.9t=18.9

t= 18.9/4.9

t=3.86 seconds


May 20th, 2015

wrong

May 20th, 2015

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