The kinetic energy refers to energy in motion. The moving dart possesses kinetic energy. From the calculations, the speed of the dart after it is thrown is 13 m/s.
The term energy refers to the ability to do work. We must note that work done is throwing the dart is equal to the kinetic energy of the moving dart once it is thrown.
If work done = kinetic energy = Fx
Where;
F = force
x = distance
W = 4.40 N * 0.54 m = 2.376 J
Now;
KE = 1/2 mv^2
m = mass of the dart
v = velocity of the dart
v = √2KE/m
v = √2 * 2.376/ 0.028
v =13 m/s
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