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ExtremeBDS [4]
3 years ago
5

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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Step-by-step explanation:

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A survey found that 12 out of every 15 people in the United States prefer eating at a restaurant over cooking at home. if 400 pe
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Factor each polynomial x^2-9x+10 <br> Show your work
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Answer:

not factorable

Step-by-step explanation:

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The easiest way to factor is to find two numbers of the "a" value (the coefficient before x^{2}) and the factors of the c value (10) that ADD up to give you -9, in this case it would be:

1          -10  --> 1(-10) gives you -10

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adding these together -10 + (-1) = -11 which does not equal -9.

You could stop here and conclude that this is not factorable by inspection.

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A chef cooks 9 lbs of chicken for 36 people and 17 lbs of chicken for 68 people
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Answer:

\frac{1}{4} lbs/person

Step-by-step explanation:

Here is the complete question: Find the rate of change for the situation:

A chef cooks 9 lbs of chicken for 36 people and 17 lbs of chicken for 68 people.

Given: 1st situation, A chef cook 9 lbs chicken for 36 people.

           2nd situation, chef cook 17 lbs chicken for 68 people.

∴ 1st situation, weight of chicken per person= \frac{9\ lbs}{36\ person} = \frac{9}{36}

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2nd situation, weight of chicken per person= \frac{17\ lbs}{68\ person} = \frac{17}{68}

Weight of chicken per person= \frac{1}{4} lbs/ person

In both the situation chef cook same amount of chicken per person, which is \frac{1}{4} lbs/ person

∴ Rate of change is \frac{1}{4} lbs/ person

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3 years ago
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