An alpha particle (m = 6.7 × 10?27 kg, q = +3.2 × 10?19 C) has a speed of 20 km/s at point A and moves to point B where it momentarily stops. Only electric forces act on the particle during this motion. Determine the electric potential difference VA?VB.
A. +4.2 V
B. ?4.2 V
C. ?9.4 V
D. +9.4 V
E. ?8.4 V
Answer: B
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