ANSWER:

Given:

k = 90 N/m

e = 0.5 m

Ee = ?

Formula:

Ee = 1/2 × k × e^2

Solution:

Ee = 1/2 × 90 × 0.5^2

Ee = 1/2 × 90 × 0.25

Ee = 11.25 J

• The elastic potential energy is 11.25 J.

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