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Vilka [71]
3 years ago
10

A body moving with a velocity of 20 m/s begins to accelerate at 3 m/s2. How far does the body move in 5 seconds?

Chemistry
2 answers:
Norma-Jean [14]3 years ago
8 0
The distance covered will be:

d = v_0\cdot t + \frac{1}{2}a\cdot t^2 = 20\frac{m}{s}\cdot 5\ s + \frac{5}{2}\frac{m}{s^2}\cdot 5^2\ s^2 = \bf 162,5\ m

The correct answer is D).
Arisa [49]3 years ago
3 0

The Correct answer to this question for Penn Foster Students is: 137.5 m

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The right line is a 90° clockwise rotation of the left line about the origin. Click the 90° clockwise button. Are these lines th
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Switch the coordinates and change the sign of the second one by multiplying it by negative 1.

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Here are some examples and a more general way to understand the problem.

Consider the point (1,1), a 90 degree rotation clockwise about the origin would move it into the 4th quadrant.

The new point is (1,-1) , similarly (-4,2)-> (2,4), (-4,3)-> (3,4)

We take a point p= (x,y) the the result of rotation p 90 clockwise about the orgin is a new point p'=(x',y')= (-y, x). .

In the case of p=(1,0) the new point is p'= (0, -1)

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If we let a=90 degrees we have

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|0 1|

|-1 0|

Call that matrix M

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How about the point on the y axis (0,1), it should go to the point (1,0)

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