Which is true about an object being pulled behind a person? A
It moves at the same speed as the person, but it moves in a different direction.
B
It moves faster than the person, and it moves in the same direction.
С
It moves slower than the person, and it moves in a different direction.
D
It moves at the same speed, and it moves in the same direction as the person.

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.