10) If you blow between 2 pieces of paper hanging vertically, a) The pieces will move farther apart because the increased air speed causes a decrease in pressure between the pieces
b) The pieces will move farther apart because the increased air speed causes an increase in pressure between the pieces
c) The pieces will move closer together because the increased air speed causes a decrease in pressure between the pieces
d) The pieces will move closer together because the increased air speed causes an increase in pressure between the pieces

Aspring has a relaxed length of 33 cm (0.33 m) and its spring stiffness is 6 n/m. you glue a 76 gram block (0.076 kg) to the top of the spring, and push the block down, compressing the spring so its total length is 15 cm. you make sure the block is at rest, then at time t=0 you quickly move your hand away. the block begins to move upward, because the upward force on the block by the spring is greater than the downward force on the block by the earth. calculate y vs. time for the block during a 0.09-second interval after you release the block, by applying the momentum principle in three steps each of 0.03-second duration.