A force of 4.40 N is applied to a dart over a distance of 54 cm.The dart has a mass of 28 g.Assuming no energy is lost due to friction,what will be the kinetic energy of the dart after it is thrown?

Answer 1

Assuming the dart starts from rest and the force is applied horizontally, calculate the work done by the applied force. That equals the change in kinetic energy. If the dart started from rest, the work done equals its kinetic energy.

F = applied force = 4.40 N

x = distance force is applied = 0.54 m (note the unit of meters)

W = work = Fx

K = kinetic energy

W = ΔK = K (if started from rest)

K = Fx

You know F and x. Plug in the numbers and get K in joules.