A hot air balloonist rising vertically with a constant velocity of magnitude 5.0 m/s, releases a sandbag at an instant when the balloon is 40 m about the ground. After its released the sandbag is in free fall. a. Compute the position and velocity of the sandbag at .25 s and 1s after its release.
b. How many seconds will it take for the bag to hit the ground?
c. With what velocity magnitude does it strike the ground?
d. What is the greatest height above the ground that the sandbag reaches

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".