Arifle fires a 2.10 x 10-2 kg pellet straight upward, because the pellet rests on a compressed spring that is released when the trigger is pulled. the spring has a negligible mass and is compressed by 9.10 x 10-2 m from its unstrained length. the pellet rises to a maximum height of 6.10 m above its position on the compressed spring. ignoring air resistance and any other friction force, determine the spring constant.

be sure the answer is correct this means a lot to my grade this semester and i just can not seem to get it.

Asilver dollar is dropped from the top of a building that is 1324 feet tall. use the position function below for free-falling objects. s(t) = −16t2 + v0t + s0 (a) determine the position and velocity functions for the coin. s(t) = v(t) = (b) determine the average velocity on the interval [1, 2]. ft/s (c) find the instantaneous velocities when t = 1 second and t = 2 seconds. v(1) = ft/s v(2) = ft/s (d) find the time required for the coin to reach the ground level. (round your answer to three decimal places.) t = s (e) find the velocity of the coin at impact. (round your answer to three decimal places.) ft/s