If you throw a ball up into the air with an initial vertical velocity of 30 m/s, how long will the ball be in the air before it comes all the way back down to your hand?
18.12 s
12.12 s
10.12 s
6.12 s

A1500 w electric heater is plugged into the outlet of a 120 v circuit that has a 20 a circuit breaker. you plug an electric hair dryer into the same outlet. the hair dryer has power settings of 600 w, 900 w , 1200 w, and 1500 w. you start with the hair dryer on the 600 w setting and increase the power setting until the circuit breaker trips. under what setting does the circuit breaker trip.