Assuming negligible friction, what spring constant would be needed by the spring in a "B-B gun" to fire a 10. gram pellet to a height of 100 meters if the spring is initially compressed 10. cm?
A) 20. N/cm
B) 20. N/m
C) 200. N/m
D) 2.0 × 103 N/cm
E) 2.0 × 10-3 N/m
A
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