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Q. A 65 kg skier leaves the end of a ski-jump ramp with a velocity of 23 m/s directed 25° above the horizontal. Suppose that as a result of air drag the skier returns to the ground with a speed of 19 m/s, landing 13 m vertically below the end of the ramp. From the launch to the return to the ground, by how much is the mechanical energy of the skier-Earth system reduced because of air drag?

Q. Two stationary positive point charges, charge 1 of magnitude 3.10 nC and charge 2 of magnitude 1.74 nC, are separated by a distance of 36.0 cm. An electron is released from rest at the point midway between the two charges, and it moves along the line connecting the two charges.

What is the speed v_final of the electron when it is 10.0 cm from charge 1?

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