solve please

The graph at right depicts the acceleration of a particle moving [m/s?] 2 along the y-axis. At time t = 6 sec, the velocity of the particle is (+4.5 m/s). What is the velocity of the particle at t - 11 sec? 1 (a) (+3.0 m/s) 1 2 3 4 5 6 7 8 (b) (+6.0 m/s) (c) (+1.5 m/s) -1 (d) (+4.5 m/s) (c) (+7.5 m/s)