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galina1969 [7]
3 years ago
6

Which is a example of speed? A)Cindy biked westward at 30km/h B)A Rock is the the left of a flowerpot C) A dog runs an average o

f 8mp/h D) Leo lives 2miles north of Andre
Physics
2 answers:
r-ruslan [8.4K]3 years ago
5 0
Hey there!

Here is your answer:

<u>The proper answer to this question is option C "</u><span><u>A dog runs an average of 8mp/h".</u>

Reason:

<u>The sentence </u></span><span><u>A dog runs an average of 8mp/h (option C) is a example of speed because it is telling the average SPEED of a dog which is 8 miles per hour.</u>

Also....

<u>Its not option A because km/h is a distance. Its not option B because its just saying where the rock is located. Its also not option D because its just saying the distance of where Leo lives.</u>

Therefore the answer is option C.

If you need anymore help feel free to ask me!

Hope this helps!

~Nonportrit</span>
finlep [7]3 years ago
4 0
I think the answer is A) Cindy biked westward at 30km/h. I'm sorry if I'm wrong. If that's not correct then it's definitely C) A dog runs an average of 8mp/h. I hope this helps. :) 
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Answer:

V = 331.59m/s

Explanation:

First we need to calculate the time taken for the shell fire to hit the ground using the equation of motion.

S = ut + 1/2at²

Given height of the cliff S = 80m

initial velocity u = 0m/s²

a = g = 9.81m/s²

Substitute

80 = 0+1/2(9.81)t²

80 = 4.905t²

t² = 80/4.905

t² = 16.31

t = √16.31

t = 4.04s

Next is to get the vertical velocity

Vy = u + gt

Vy = 0+(9.81)(4.04)

Vy = 39.6324

Also calculate the horizontal velocity

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Vx = 329.21m/s

Find the magnitude of the velocity to calculate speed of the shell as it hits the ground.

V² = Vx²+Vy²

V² = 329.21²+39.63²

V² = 329.21²+39.63²

V² = 108,379.2241+1,570.5369

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V = √ 109,949.761

V = 331.59m/s

Hence the speed of the shell as it hits the ground is 331.59m/s

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