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Ainat [17]
4 years ago
8

A plane flies with an average velocity of -98.5 m/s for 45.0s. what was it's displacement?

Mathematics
1 answer:
balandron [24]4 years ago
6 0
V-average velocity
V=98.5 m/s
t-time
t=45s
s-displacement
s=?

V=\frac{s}{t}
s=V*t=98.5\frac{m}{s}*45s=4432.5m=4.4325 km
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Answer:

Step-by-step explanation:

I don't know if you are a calculus student, but since calculus is the easiest way to solve this, that's what I used.  The position equation is

s(t)=-6t^2+24t+14

and the velocity function, the first derivative, is

v(t)=-12t+24

From Physics, you should know that the velocity of an object is 0 at its highest point.  That means that if we sub in a 0 for the velocity and solve for t, we find the time at which the object is at its highest point.  That is:

0=-12t+24 and

0=-12(t-2)

By the Zero Product Property,

-12 definitely does not equal 0, so that means that

t - 2 = 0 and

t = 2 seconds.

So at 2 seconds, the object is at its highest point.  Go back to the position function now and sub in a 2 for t to find the height of the object at 2 seconds.

s(2)=-6(2)^2+24(2)+14 so

s(2) = 38 meters

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3 years ago
Explain how to estimate 586 - 321 two different ways
murzikaleks [220]
<span>To estimate 586 - 321, you can round the numbers up or down to the nearest five.
586 can either become 570, rounding up, or 585, rounding down, which is closer. 321 becomes 320. It's not close enough to 325, nor to 315, for either of those to be good choices. 570 - 320 = 250 and 585 - 320 = 265. The actual solution to the original problem is 265, so, the second estimate, because they both go down by 1, is the closest.</span>
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What are the solutions to the quadratic equation x^2-16=0
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I hope this helps you

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Etta buys some ribbon and cuts it into 5 pieces that are the same length. Each piece is 9 inches long. How long was the ribbon t
Ivenika [448]

Answer:

The ribbion she bought is 45 inches long

Step-by-step explanation:

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Brut [27]

Answer:

Cost per night: 75

Equation: y = 75x + 50

Step-by-step explanation:

An equation to represent the situation can be written in the slope-intercept form, y = mx + b, where,

m = slope of the graph, which is the rate per night.

b = y-intercept, which is the initial fee. It is the point where the line intercepts the y-axis.

Let's find m, using two points on the line, (2, 200) and (4, 350)

slope (m) = \frac{y_2 - y_1}{x_2 - x_1} = \frac{350 - 200}{4 - 2} = \frac{150}{2} = 75

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Substitute m = 75, and b = 50 into y = mx + b.

✅The equation would be:

y = 75x + 50

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