Respuesta :

Answer;

= 5.68 m/s

Explanation;

  • From the law of conservation of energy, energy is neither created nor destroyed but can be transformed to different forms.
  • Therefore when a body is a t rest is has potential energy which is converted to kinetic energy when it starts moving at a certain speed.

Kinetic energy = 1/2 mv², where m is the mass and v is the velocity.

K.E = 1/2 mv²

250 J = 1/2 × 15.5 × v²

v² = (250 ×2 )/15.5

v² = 32.2581

v = 5.6796

  ≈ 5.68 m/s

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