A hot-air balloonist, rising vertically with a constant speed of 4.00 m/s, releases a sandbag at the instant the balloon is 12.0 m above the ground. After it is released, the sandbag encounters no appreciable air drag. Assume the magnitude of gravity as 10 m/s2.

a. Compute the position and the velocity of the sandbag at 2.00 s after its release b. How many seconds after its release will the bag strike the ground? c. How fast it is moving as it strikes the ground?