1. A hot-air balloonist, rising vertically with a constant velocity of magnitude 5.00 m/s releases a sandbag at an instant when the balloon is 40.0 m above the ground (Figure shown to the right). After it is released, the sandbag is in free fall. (a) Compute the position and velocity of the sandbag (b) at 0.250 s and 1.00 s after its release. 2. In the fastest measured tennis serve, the ball left the racquet at 73.14 m/s. A served tennis ball is typically in contact with the racquet for 30.0 ms and starts from rest. Assume constant acceleration. (a) What was the ball's acceleration during this serve? (b) How far did the ball travel during the serve? 3. In the fastest measured tennis serve, the ball left the racquet at 73.14 m/s. A served tennis ball is typically in contact with the racquet for 30.0 ms and starts from rest. Assume constant acceleration. (a) What was the ball's acceleration during this serve? (b) How far did the ball travel during the serve