a)What is the power due to each force acting on the box at the instant and what is the net power? Is the net power changing at
that instant

b)If the magnitude of **F**2 is, instead, 6.0 N, what
is the net power, and
is it changing?

P1 = F1 v cos 180 = -6.0 W

P2 = F2 v cos 60
= 6.0 W

Pnet = 0
→ K is const → v is const → Pnet is
const.

P2 = F2 v cos 60
= 9.0 W

Pnet = 3.0
W → K is inc. → v is inc. → Pnet is changing.