Easy ways an object can accelerate are 1. The object can speed up directly in line with the velocity of the object. Like stepping on the gas in the car the second way an object can accelerate is to slow down, accelerate, directly opposite to the objects velocity. Like stepping on the brakes the third way in object can accelerate into accelerate normally with the objects velocity similar to turning a corner. Objects can also accelerate in any number of combinations such as stopping and starting speeding up around the corner etc.