The arrow gains kinetic energy because of work done by the bow. The bow acts as spring. When pulled back, all the energy is stored in the bow in the form of potential energy and when it's released, potential energy is converted into kinetic energy.
According to work-energy theorem,
Work done by all forces = change in kinetic energy.
F.x = (K.E)f - (K.E)i
= (K.E)f -0
250×0.6 = (K.E)f
(K.E)f = 150 J.
"Kinetic energy is the energy of motion, observable as the movement of an object, particle, or set of particles. "Any object in motion is using kinetic energy: a person walking, a thrown baseball, a crumb falling from a table, and a charged particle in an electric field are all examples of kinetic energy at work.
"Work is done when a force acts upon an object to cause a displacement." Three quantities must be known in order to calculate the amount of work. Those three quantities are force, displacement and the angle between the force and the displacement.
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