Question

what are the three ways to accelerate?
speed up
change direction
move very fast
sit still
move very slow
slow down

Explanation:

Acceleration is a vector quantity. It occurs when there is a change in velocity. Velocity has both magnitude (speed) and direction. Speeding up means an increase in the magnitude of velocity. Changing direction means a change in the velocity vector's direction (even if speed is constant, like in uniform circular motion). Slowing down (deceleration) is also a form of acceleration as it is a change in the magnitude of velocity (a negative change). Moving very fast or slow without a change (constant speed) and sitting still (zero velocity, no change) do not involve acceleration.

Answer:

Speed up, Change direction, Slow down