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20 December, 01:05

A child does 5.0 J of work on a spring while loading a ball into a spring-loaded toy gun. If mechanical energy is conserved, what will be the kinetic energy of the ball when it leaves the gun?

A 0 J

B 3.7 J

C 2.5 J

D 5.0 J

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Answers (1)
  1. 20 December, 01:24
    0
    Option D is the correct answer.

    Explanation:

    Here mechanical energy is conserved.

    Kinetic energy + Potential energy = Constant.

    First the child does 5.0 J of work on a spring while loading a ball into a spring-loaded toy gun.

    That is potential energy = 5 J

    Kinetic energy = 0 J

    Kinetic energy + Potential energy = 0 + 5 = 5 J

    Secondly the spring is released.

    That is potential energy = 0 J

    Kinetic energy = ?

    Kinetic energy + Potential energy = Constant = 5 J

    Kinetic energy + 0 = 5 J

    Kinetic energy is 5 J

    Option D is the correct answer.
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