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2 years ago

A group of friends recorded how fast tthey could run a 100 meters

Mathematics

2 answers:

Maru [420]2 years ago

8 0

Answer:

58.4

Step-by-step explanation:

Runner 1 ran 14.85 and Runner 2 ran 14.05 from there you need to add the two together and you get 28.90. From there you can add Runner 3 and Runner 4 time together and you get 29.50.

After that you add them together and you get 58.4

I hope this helps! Let me know if you need more help on this question.

Liula [17]2 years ago

8 0

58.4 is the correct answer

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**A rock dropped from a 100 foot tower.

mars1129 [50]

Answer:

2.83 s

Step-by-step explanation:

We are given that

$h(t)=-16t^2+10t+100$

When a rock reached the ground then h(t)=0

$-16t^2+10t+100=0$

$16t^2-10t-100=0$

Using quadratic formula

$x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$

$t=\frac{10\pm\sqrt{(-10)^2-4\times 16\times (-100)}}{2(16)}$

$t=\frac{10\pm\sqrt{100+6400}}{32}$

$t=\frac{10+\sqrt{6500}}{32}=2.83$

$t=\frac{10-\sqrt{6500}}{32}=-2.2$

Time cannot be negative .Therefore, negative value of t can not be possible.

Hence, the rock takes 2.83 sec to reach the ground.

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3 years ago

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zmey [24]

Answer:

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Step-by-step explanation:

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salantis [7]

Answer:

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Step-by-step explanation:

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svp [43]

Answer:

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Step-by-step explanation:

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