A1542 kg car has a speed of 13.4 m/s when it hits a tree. the tree doesn’t move and the car comes to rest. find the change in kinetic energy of the car. answer in units of j.

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.