Arock is thrown downward from an unknown height above the ground with an initial speed of 21m/s. it strikes the ground 8s later. determine the initial height of the rock above the ground. the acceleration of gravity is 9m/s/s. answer in units of m

The respiratory system removes oxygen and water from the body. select the best answer from the choices provided t f

*drag each tile to the correct location in the sequence* the table shows chronological events in the life of our sun, a medium-sized star. place the missing events into the correct rows of the table.

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.