Aposition-time graph is shown for a motorcycle driving south. according to the graph, what is the motorcycle’s average velocity? a) 5 km/h southb) 24 km/h southc) 120 km/h southd) 150 km/h south

Aresistor with an unknown resistance is connected in parallel to a 9 ω resistor. when both resistors are connected in parallel to an emf source of 21 v, the current through the unknown resistor is measured with an ammeter to be 4 a. what is the resistance of the unknown resistor? answer in units of ω.