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Q. A stone is catapulted at time , with an initial velocity of magnitude 20.0 m/s and at an angle of 40.0° above the horizontal. What are the magnitudes of the (a) horizontal and (b) vertical components of its displacement from the catapult site at ? Repeat for the (c) horizontal and (d) vertical components at , and for the (e) horizontal and (f) vertical components at .

Q. A resistor with an unknown resistance is connected in parallel to a 12 ohm resistor. When both resistors are connected to an emf source of 12 V, the current across the unknow resistor is measured with an ammeter to be 3.0 A. What is the resistance of the unknow resistor?

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