How much power is necessary to do 43 Joules of work in 7 seconds?

Can somebody explain to me how newton's 3rd law relates to momentum? ~ap physics 1

State one advantage and one disadvantage of using a plane mirrior as a driving mirrior

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.