What is the law that states that matter can not be created nor destroyed?

A)The Law of Conservation of Matter

B)The Law of the Land

C)The Law of Universal Gravitation

D)The Law of Thermodynamics

Aclarinetist, setting out for a performance, grabs his 3.350 kg clarinet case (including the clarinet) from the top of the piano and carries it through the air with an upward force of 24.65 n. find the case's vertical acceleration. indicate an upward acceleration as positive and a downward one as negative.