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Monica [59]
3 years ago
6

Amy usually swims 20 laps in 30 minutes what is her rate per minutes

Mathematics
1 answer:
Karo-lina-s [1.5K]3 years ago
6 0

Answer:

1.5

Step-by-step explanation:

Because if you divide 30 by 20 you get 1.5 to check if it’s correct you multiple 1.5 by 20

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Jim is trying to improve his speed on the track so he can qualify for the State Championships. As he is running, he goes from 70
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Answer:

His acceleration is \frac{1}{15} meters per seconds²

Step-by-step explanation:

Acceleration is the rate of change of the speed

The formula of acceleration is a=\frac{v_{f}-v_{i}}{t} , where

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∵ Jim goes from 70 meters/minute (beginning speed) to

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∴ His initial speed v_{i} = 70 meters/minute

- Change it the meter per second

∵ 1 minute = 60 seconds

∴ \frac{70}{(1)(60)}=\frac{70}{60}=\frac{7}{6}  meters/second

∴ v_{i} = \frac{7}{6}  meters/second

∵ His final speed v_{f} = 106 meters/minute

- Change it the meter per second

∴ \frac{106}{(1)(60)}=\frac{106}{60}=\frac{53}{30}  meters/second

∴ v_{f} = \frac{53}{30}  meters/second

∵ The time of the change of his speed is 9 seconds

∴ t = 9

∵ The formula of acceleration is a=\frac{v_{f}-v_{i}}{t}

- Substitute the values of t, v_{i}  and v_{f} in the formula above

∴  a=\frac{\frac{53}{30}-\frac{7}{6}}{9}=\frac{1}{15}

∴ His acceleration is \frac{1}{15} meters per seconds²

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