3 years ago

Please help ASAP trying finsh a class fast

Mathematics

2 answers:

boyakko [2]3 years ago

8 0

Answer:

Step-by-step explanation:

it is B, it is B, it Is B, it is B

sergey [27]3 years ago

6 0

Answer: b) pi = C/2r

Step-by-step explanation:

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A porch has the shape of a semicircle with a diameter of 7 ft.

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A = pi * r^2

R = D / 2

R = 7 / 2

R = 3.5

A = 3.14 * 3.5^2

A = 3.14 * 12.25

A = 38.465

Divide it by 2 since its a semi-circle:

38.465 / 2 = 19.2325

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What is the average acceleration of a southbound train that slows down from 15 m/s to 8.6 m/s in 1.2 s?

horrorfan [7]

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The average acceleration of train is $5.34\ m/s^2$

Step-by-step explanation:

We have,

A train that slows down from 15 m/s to 8.6 m/s in 1.2 s. It means that 15 m/s is its initial velocity and 8.6 m/s is its final velocity.

It is required to find the average acceleration of the train.

$a=\dfrac{v-u}{t}\\\\a=\dfrac{(8.6-15)\ m/s}{1.2\ s}\\\\a=-5.34\ m/s^2$

The average acceleration of train is $5.34\ m/s^2$ . Negative signs shows that the train is decelerating.

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