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andrew11 [14]
3 years ago
11

Raphael is traveling in a straight line at a constant speed from point A to point B. His distance from point B in miles is -20t+

45, where t is number of hours he has been traveling. What is his speed in miles per hour?
Mathematics
1 answer:
Rudik [331]3 years ago
7 0

Answer:

Speed  = 20 mi/h

Explanation:

There are two points A and B

Distance between both the points are define with function -20t + 45 miles

where t represent the number of hours of travelling.

Now firstly we find the initial position. At starting time is 0, so we put t=0 in given function of t.

At t=0;

d₀ = -20(0) + 45 = 0 + 45 = 45 miles

Now we find the distance travell after starting first hour.

Than we put t = 1 in the given function

At t = 1;

d₁ = -20(1) + 45 = -20 + 45 = 25 miles

Difference between d₁ & d₀ is

45 - 25 = 20 miles

We see that in one hour, total distace is covered 20 miles

Now we use time, speed, distance relation

Speed = distance/time

Speed= \frac{20}{1}

Speed = 20 miles/hour

That's the final answer.

I hope it will help you.

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Answer:

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Step-by-step explanation:

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72/300 = 0.24 x 100

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3 years ago
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Answer:

4x² + 4y² + 8xy

Step-by-step explanation:

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Formula : -

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Here,

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( 2x + 2y )²

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2 years ago
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2 years ago
What is the kinetic Energy of a 110 kg linebacker rushing towards his football
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<u>Answer:</u>

The Kinetic energy of the 110 kg linebacker is 1375 J

<u>Solution:</u>

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Therefore, the formula for kinetic energy is

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Here, The linebacker’s mass m = 110 kg

The linebacker’s velocity v = 5 m/s

So by substituting the values,

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