The Velocity of a Particle Moving Along the X Axis

Multiple Choice

The velocity of a particle moving along the x axis changes from v_i to v_f.For which values of v_i and v_f is the total work done on the particle positive?

A) v_i = 5m/s, v_f = 2m/s
B) v_i = 5m/s, v_f = -2m/s
C) v_i = -5m/s, v_f = -2m/s
D) v_i = -5m/s, v_f = 2m/s
E) v_i = -2m/s, v_f = -5m/s