Aparachutist jumps from a plane. he accidentally drops his cell phone at an altitude of 100 m when he has a velocity of 12 m/s down. what is the velocity of the phone when it hits the ground? assume there is no air resistance acting on the phone.

Suppose while hauling rocks, you accidentally drop one. it breaks apart in flat, planar sections. what type of rock did you just drop? 20 points

For most stars, what does a higher temperature tend to to with? a lower luminosity a higher luminositya red color none of the above

Diego is trying to lift a piano to the second floor of his house. diego uses a pulley system and gives a big lift to the piano. the piano moves upward, then stops, and then it starts to fall to the ground. which list best describes the forces on the piano in the proper order? a.positive force, balanced force, negative force b.negative force, balanced force, positive force c.positive force, unbalanced force, negative force d. negative force, unbalanced force, positive force