Calculate the speed of a 15.5 kg object which has 250 J of energy.

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