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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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3 years ago
What is the slope of the line between (-4, 4) and (-1, -2)? (1 point)<br> 0 1<br> C 2<br> 0-2<br> -1
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3 years ago
Given the function f(x) = -0.5|2x + 2| + 1, for what<br> values of x is f(x) = 6?
Licemer1 [7]

Answer:

<em>No values of x can make f(x)=6</em>

Step-by-step explanation:

Equation with Absolute Value

The absolute value of a number is always positive. That condition must be met when solving equations. Any condition that goes against the rule, must be discarded and not part of the solution.

The function provided in the question is:

f(x) = -0.5|2x + 2| + 1

We need to find the value(s) of x that make:

f(x)=6

It needs to solve the equation:

-0.5|2x + 2| + 1=6

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-0.5|2x + 2| =6-1=5

Dividing by -0.5:

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We reach to this equation to solve:

|2x + 2| =-10

As stated above, the absolute value is always positive, and the equation forces the absolute value to be negative. There is no possible value of x that makes the absolute value negative, thus:

No values of x can make f(x)=6

6 0
3 years ago
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