physics

A rifle fires a 1.27 x 10-2-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 7.87 x 10-2 m from its unstrained length. The pellet rises to a maximum height of 7.90 m above its position on the compressed spring. Ignoring air resistance, determine the spring constant.

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