(this is for physics btw please help me this is due today) 12. José has a mass of 70 kg, what is his weight?

13. On the surface of the earth, how much does a 10 kg mass weigh?

14. On the surface of the earth a box weighs 49 N. What is its mass?

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.