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REY [17]
3 years ago
12

- Suppose you increase your running speed from 7 m/s to 9 m/s in a period of 2 s. What is

Mathematics
1 answer:
loris [4]3 years ago
3 0

Step-by-step explanation:

  • Initial velocity (u) = 7 m/s
  • Final velocity (v) = 9 m/s
  • Time taken (t) = 2s

\dashrightarrow \quad \rm {a = \dfrac{v -u}{t} } \\

  • <em>a</em> denotes acceleration
  • <em>v</em> denotes final velocity
  • <em>u</em> denotes initial velocity
  • <em>t</em> denotes time

\dashrightarrow \quad \rm {a = \dfrac{9 -7}{2} \; m \: s^{-2}} \\

\dashrightarrow \quad \rm {a = \dfrac{2}{2} \; m \: s^{-2}} \\

\dashrightarrow \quad \underline{\boxed{\bf {a = 1 \; m \: s^{-2}}}} \\ (Answer)

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RUDIKE [14]
143 oz

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hope this helps,
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3 years ago
Simplifying fractions Sheet 2<br>​
raketka [301]

<u>Simplifying fractions:</u>

1) \frac{14}{20} =\frac{7}{10}                  2) \frac{4}{8} =\frac{1}{2}

3) \frac{9}{12} =\frac{3}{4}                  4) \frac{12}{15} =\frac{4}{5}

5) \frac{8}{18} =\frac{4}{9}                  6) \frac{14}{21} =\frac{2}{3}

7) \frac{12}{16} =\frac{3}{4}                  8) \frac{10}{24} =\frac{5}{12}

9) \frac{15}{35}=\frac{3}{7}                 10) \frac{13}{26} =\frac{1}{2}

11) \frac{11}{55}=\frac{1}{5}                12) \frac{9}{21} =\frac{3}{7}

13) \frac{16}{26} =\frac{8}{13}              14) \frac{20}{32} =\frac{5}{8}

15) \frac{18}{24} =\frac{3}{4}               16) \frac{21}{27} =\frac{7}{9}

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3 years ago
Number of Text Messages a Day A random sample of n = 755 US cell phone users age 18 and older in May 2011 found that the average
Alexeev081 [22]

Answer:

The 95% confidence interval is  (29.54 - 53.46}

Step-by-step explanation:

given data:

\hat X = 41.5

Se = 6.1

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b) at 95% confidence interval

\alpha = 1- 0.95 = 0.05

\alpha /2 = 0.025

z_{\alpha/2} = z_{0.025} = 1.96

at 95% confidence interval for [/tex]\mu[/tex]

\hat x \pm z_{\alpha /2} \times Se

41.5 \pm 1.96\times 6.1

41.5 \pm 11.96

The 95% confidence interval is  (29.54 - 53.46}

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