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Alex17521 [72]
3 years ago
11

WILL MARK BRAINLIEST!!!!

Physics
1 answer:
Ksju [112]3 years ago
8 0

Explanation:

kinetic energy = 1 /2 x mass x velocity²

substitute the values given into the equation

250 = 1/2 x 20 x velocity ² ( remember it is velocity squared )

5 m/s = velocity

hope this helps bro

please mark it brainliest

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As a planet's semimajor axis gets smaller, its speed will _______ and its period will _________ .
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3 years ago
A particle of mass 4.00 kg is attached to a spring with a force constant of 100 N/m. It is oscillating on a frictionless, horizo
jeka57 [31]

Answer:

a. A = 0.735 m

b. T = 0.73 s

c. ΔE = 120 J decrease

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Explanation:

a.

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¹/₂ * m * v²max = ¹/₂ * k * A²

m * v² = k * A²  ⇒ 10 kg * 4 m/s = 100 N/m * A²

A = √1.6 m ² = 1.26 m

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b.

T = 2π * √m / k ⇒ T = 2π * √4.0 kg / 100 N/m = 1.26 s

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c.

E = ¹/₂ * m * v²max =

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E₂ = ¹/₂ * 10 * 4² = 80 J

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d.

The missing energy has turned into interned energy in the completely inelastic collision

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