Two blocks with masses m1=0.25kg and m2=1.4kg approach each other along a horizontal, frictionless track. the initial velocities of the blocks are v1=1.20 m/s to the right and v2=0.34 m/s to the left. the two blocks then collide and stick together as shown in the figure. which of the graphs could represent the force of block 1 on block 2 during the collision.

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.