A rifle fires a 2.10 102 -kg pellet straight upward,
Chapter 10, Problem 10.86(choose chapter or problem)
A rifle fires a 2.10 102 -kg pellet straight upward, because the pellet rests on a compressed spring that is released when the trigger is pulled. The spring has a negligible mass and is compressed by 9.10 102 m from its unstrained length. The pellet rises to a maximum height of 6.10 m above its position on the compressed spring. Ignoring air resistance, determine the spring constant. 3
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