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Leokris [45]
3 years ago
10

How does a bicycle rider's energy of motion changes as the gain speed while riding down a hill?

Physics
1 answer:
kaheart [24]3 years ago
8 0
It is b. It gains momentum when going down. Think of it like a sled. When you go up the hill, it goes slower, but when you go down the hill, you gain speed(momentum) and it increases
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Answer:

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Sam receives the kicked football on the 3 yd line and runs straight ahead toward the goal line before cutting to the right at th
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Answer:

Distance: 21 yd, displacement: 15 yd, gain in the play: 12 yd

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The distance travelled by Sam is just the sum of the length of each part of Sam's motion, regardless of the direction. Initially, Sam run from the 3 yd line to the 15 yd line, so (15-3)=12 yd. Then, he run also 9 yd to the right. Therefore, the total distance is

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The displacement instead is a vector connecting the starting point with the final point of the motion. Sam run first 12 yd straight ahead and then 9 yd to the right; these two motions are perpendicular to each other, so we can find the displacement simply by using Pythagorean's theorem:

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Finally, the yards gained by Sam in the play are simply given by the distance covered along the forward-backward direction only. Since Sam only run from the 3 yd line to the 15 yd line along this direction, then the gain in this play was

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