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Tom [10]
2 years ago
14

A dolphin jumps out of the water with

Mathematics
1 answer:
Mandarinka [93]2 years ago
3 0

Answer:

t=1.25\ sec

Step-by-step explanation:

we have

h(t)=-16t^{2}+20t

where

t is the time in seconds

h is the dolphin's height in feet

we know that

When the dolphin return to the water the value of h(t) is equal to zero

so

For h(t)=0

0=-16t^{2}+20t

16t^{2}=20t

Simplify

16t=20

t=\frac{20}{16}

t=\frac{5}{4}=1.25\ sec

see the attached figure to better understand the problem

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