A 050-Kg Object Moves in a Horizontal Circular Track with a a Radius

Multiple Choice

A 0.50-kg object moves in a horizontal circular track with a radius of 2.5 m.An external force of 3.0 N, always tangent to the track, causes the object to speed up as it goes around.The work done by the external force as the mass makes one revolution is:

A) 7.5 J
B) 24 J
C) 47 J
D) 94 J
E) 120 J