3 years ago

What speed must you toss a ball straight up so that it takes 4 s to return to you? Show your work.

1 answer:

4 0

1) Type of motion: constant acceleration.

2) acceleration, a = 9.8 m/s^2

3) time up = time down = 4seconds / 2 = 2 seconds

4) formula = Vf = Vo - a*t^2/2

Vf = 0 => Vo = a*t^2 / 2 = 9.8m/s^2 * (2 s)^2 / 2 = 19.6 m/s

Answer: 19.6 m/s

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When 2 5/8 is written as an improper fraction in lowest terms, what is the numerator of the fraction?

Mama L [17]

Option E

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<h3><u>Solution:</u></h3>

$2\frac{5}{8}$ is to be written as improper fraction in lowest terms

To find: numerator of fraction

An improper fraction is a fraction in which the numerator (top number) is greater than or equal to the denominator (bottom number).

<em><u>To convert a mixed fraction to an improper fraction, follow these steps:</u></em>

Multiply the whole number part by the fraction's denominator.

Add that to the numerator.

Then write the result on top of the denominator.

$2\frac{5}{8} = \frac{8 \times 2 + 5}{8} = \frac{16 + 5}{8} = \frac{21}{8}$

Thus the numerator of fraction is 21. Option E is correct

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