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kotegsom [21]
3 years ago
13

A motorcyclist sees a branch in the road and hits the brakes, slowing down at -6.42 m/s. if it takes him 2.85 seconds to stop, w

hat was his starting velocity?
Physics
1 answer:
TEA [102]3 years ago
5 0

Use the definition of average acceleration:

<em>a</em> = ∆<em>v</em> / <em>t</em>

If <em>v</em> is the starting speed, then ∆<em>v</em> = 0 - <em>v</em>, so solve for <em>v</em> :

-6.42 m/s² = (0 - <em>v</em>) / (2.85 s)

<em>v</em> = (6.42 m/s²) (2.85 s)

<em>v</em> ≈ 18.3 m/s

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Answer: A

Explanation:

Lunar eclipses work the same way in a different order: Moon, Earth and Sun all on a line. In this case the Earth's shadow hides the Moon from view.

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Abigail runs one complete lap (400m) around the track, while Gabi runs a 50 meter dash in a straight line. Which runner had a gr
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Answer:

\boxed {\boxed {\sf Gabi \ had \ greater \ displacement}}

Explanation:

Displacement is the change in the position of an object.

Abigail runs a complete lap around the track, which is 400 meters. Even though she ran 400 meters, she has <u>no displacement.</u> If she starts and ends at the same spot, there is no change in position.

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2 years ago
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A volleyball player’s hand applies a 39 N force while in contact with a volleyball for 2 seconds. What is the impulse on the bal
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Given:
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t = 2 s, the time interval in which the force is applied.

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Answer:

25.9 g

Explanation:

= 17.35

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*so sorry if wrong

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