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3 years ago

I NEED HELP PLEASE, THANKS! :)

Mathematics

1 answer:

e-lub [12.9K]3 years ago

6 0

Answer:

2.908 s

Step-by-step explanation:

The "work" is most easily done by a graphing calculator. We only need to tell it the equation of motion.

For speeds in feet per second, the appropriate equation for vertical ballistic motion is ...

h(t) = -16t² +v₀t +s₀

where v₀ is the initial vertical velocity in ft/s and s₀ is the initial height in feet. The vertical velocity is the vertical component of the initial velocity vector, so is (65 ft/s)(sin(44°)). We want to find t for h=0.

0 = -16t² +65sin(44°) +4

Dividing by -16 gives ...

0 = t^2 -2.82205t -0.2500

Using the quadratic formula, we find ...

t ≈ (2.82205 ±√(2.82205² -4(1)(-0.25))/2 ≈ 1.41103 +√2.24099

t ≈ 2.90802

It will take about 2.908 seconds for the discus to reach the ground.

_____

<em>Comment on the question</em>

You're apparently supposed to use the equation for ballistic motion even though we know a discus has a shape that allows it to "fly". It doesn't drop like a rock would.

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Answer:

Hello!

Judging by the question you have provided I have deduced that the correct answer is:

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Step-by-step explanation:

To come across this answer I assumed that $\frac{3}{8}$ of the stickers are flowers, $\frac{1}{8}$ of the stickers are plants, and the wrest of the stickers are people.

I then realized that I could look at the equation this way:

If we already know how many stickers are not people, we can then add up the amount of stickers we know are not people, and then subtract that amount from the total amount of stickers to figure out how many left can be people!

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