Question

A rifle fires a 2.89 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 7.72 x 10^-2 m from its unstrained length. The pellet rises to a maximum height of 6.98 m above its position on the compressed spring. Ignoring air resistance, determine the spring constant.

Answer 1

In the given problem pellet has initially elasfic potential ennergy and then it is converted into gravitational potential enenrg when released

Spring constant k can be find using below formula