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Avi, a gymnast, weighs 40 kg. She is jumping on a trampoline that has a spring constant value of 176,400 N/m. If she compresses the trampoline by 20 cm, how high should she reach?

(Note: Ensure the unit for compression is consistent. Here, convert 20 cm to meters: 0.2 m.)

Answer :

Answer:

9 meters

Explanation:

Given:

Mass of Avi is, [tex]m=40\ kg[/tex]

Spring constant is, [tex]k=176,400\ N/m[/tex]

Compression in the spring is, [tex]x=20\ cm=0.20\ m[/tex]

Let the maximum height reached be 'h' m.

Now, as the spring is compressed, there is elastic potential energy stored in the spring. This elastic potential energy is transferred to Avi in the form of gravitational potential energy.

So, by law of conservation of energy, decrease in elastic potential energy is equal to increase in gravitational potential energy.

Decrease in elastic potential energy is given as:

[tex]EPE=\frac{1}{2}kx^2\\EPE=\frac{1}{2}\times 176400\times (0.20)^2\\EPE=88200\times 0.04=3528\ J[/tex]

Now, increase in gravitational potential energy is given as:

[tex]GPE=mgh=40\times 9.8\times h=392h[/tex]

Now, increase in gravitational potential energy is equal decrease in elastic potential energy. Therefore,

[tex]392h=3528\\\\h=\frac{3528}{392}\\\\h=9\ m[/tex]

Therefore, Avi will reach a maximum height of 9 meters.

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Rewritten by : Barada