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A toy uses a spring to shoot an arrow with a suction cup on the end. The toy shoots a 34.2 g arrow and gives it a speed of 5.50 m/s. If the efficiency of the toy is 69.0%, how much elastic potential energy was stored in the spring? Show all your work.

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Step-by-step explanation:

When spring is used to shoot an arrow, the Elastic Potential Energy is converted into Kinetic Energy.

The efficiency of Spring Toy = 69%

According to Conservation of Energy :

P. E. = K. E.

NOW,

69% of P. E. = m * v^2 / 2


P.E. = (0.0342 * 5.5 * 5.5)/(2 * 0.69) = 0.75J

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