A golf ball rolls uphill toward a mini-golf hole. Assume that the direction toward the hole is positive. If the ball starts with a speed of 2.0 m/s and slows at a rate of 0.50 m/s^2, what is its velocity after 2.0 seconds?

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a =
t =
Vf =

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.