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3 years ago

Does the KE of a car change more when it goes from 10 to 20 km/h or when it goes from 20 to 30 km/h?

Mathematics

1 answer:

Ludmilka [50]3 years ago

5 0

<h2>The change in KE is more for speed change from 20 to 30 km/h</h2>

Step-by-step explanation:

Let the mass of car be m.

Speed change from 10 to 20 km/h.

Initial speed = 10 km/hr

Initial KE = 0.5 x m x 10² = 50 m

Final speed = 20 km/hr

Final KE = 0.5 x m x 20² = 200 m

Change in KE = 200m - 50m = 150m

Speed change from 20 to 30 km/h.

Initial speed = 20 km/hr

Initial KE = 0.5 x m x 20² = 150 m

Final speed = 30 km/hr

Final KE = 0.5 x m x 30² = 450 m

Change in KE = 450m - 200m = 250m

The change in KE is more for speed change from 20 to 30 km/h

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The answer is -8

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2 years ago

The length of a rectangle is 4 centimeters more than twice its width of the perimeter of the rectangle is 86centimeters find the

lana66690 [7]

Answer:

$Width= 13 cm$

$length=30cm$

Step-by-step explanation:

Let the length of the rectangle be 'L'

And the width of the rectangle be 'W'

$Perimeter= 86 cm$

According to the statement:

$Length= 2*Width+4\\L=2W+4$

Perimeter of a rectangle= 2(Length+Width)

$86=2(2W+4+W)\\86/2=3W+4\\43=3W+4\\3W=43-4\\3W=39\\W=39/3\\W=13 cm\\\\Length(L)=2W+4\\=2(13)+4=26+4=30 cm\\Length=30 cm$

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$length=30cm$

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3 years ago

Maggie is rock climbing. After reaching the summit, she descends 14 feet in 2 1/3 minutes. If she continues at this rate, where

attashe74 [19]

Steps:
2 1/3 * 3 = 7
14 * 3 = 42
42 divided by 7 = 6
6 * 8 = 48
So, Maggie is 48 feet under the summit (-48). Therefore, the correct answer is d.

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3 years ago

A circular piece of glass has a radius of 0.8 meters. The glass sells for $4.60 per square meter. What is the total cost of the

Mama L [17]

Here given that r= 0.8

Area of circular glass = area of circle = pi r^2

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Answer $ 9.244 .

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3 years ago

Read 2 more answers

Fill in the blank to make the sentence true.<br> 19 − 6 = − 11

raketka [301]

Answer:

Step-by-step explanation:

it is very easy

19-6=-11

it is false

now the true equation is

19-6= 13

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3 years ago