Why newton’s first law is sometimes called the law of inertia? a.) because inertia is the same thing as friction b.) because inertia is the tendency of objects to resist changes in their motions c.) because inertia describes the application of force to an object in motion d.) because inertia describes the application of force to an object at rest save

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.