Suppose you want to represent the velocity of a BALL with respect to a particular frame of reference from aboard a moving TRAIN. You would most likely write the velocity of the ball using the symbol v with the subscript(s):

True or false graphs must include scales that increase by the same amount

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.

A10n falling encounters 10n of air resistance (upward force). the net force on the object is: