A rocket-powered sled accelerates uniformly from 22.0 m/s to 140 m/s while undergoing a straight-line path displacement of 275 m. What is the acceleration of the sled?
Acceleration=
A. 33.53 m/s^2
B. 34.76 m/s^2
C. 26.39 m/s^2
D. 29.46 m/s^2
E. 31.94 m/s^2
F. 32.27 m/s^2

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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.