You throw a ball vertically upward so that it leaves the ground with velocity 2.49 m/s (a) What is its velocity when it reaches its maximum altitude? magnitude m/s direction (b) What is its acceleration at this point? magnitude m/s2 direction (c) What is the velocity with which it returns to ground level? magnitude m/s direction (d) What is its acceleration at this point? magnitude m/s2 direction.