(b) The graph below plots the velocity versus time for an object, different from the one in part (a), moving in one dimension along the x direction. Vx (m/s) CO t (s) N What is the speed (magnitude of velocity in m/s) of the object at t = 2.5 s? m/s What direction is the object moving along that time interval? O O The object is not moving. What is the acceleration (in m/s2) of the object at t = 2.5 s? (Indicate the direction with the sign of your answer.) m/s2 Is the speed increasing, decreasing or constant at that time? increasing O decreasing O constant