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Problem 9: A proton is shot straight at a fixed, stationary point charge, Q. At its initial
distance of 12cm from Q, the proton has a speed of 2.8 x 10°m/s; when it reaches a distance
of 2.5cm from Q the proton's speed is 1.5 x 10°m/s. The proton's mass is 1.673 × 10-2"kg
and its charge is 1.602 × 10-19C.
What is Q?
(A) +102.6 × 10-9 C
(В) —102.6 х 10-9 С
(C) +67.2 × 10-9 C
(D) —67.2 х 10-9 С
(E) –205.1 × 10-9 C

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