The compressed potential energy of the spring is (1/2) k X^2.
This equals thesum of gravitational poteneital and kinetic energy at any altitude after it is launched.
(1/2) k (3)^2 = (1/2)M V^2 + M g H
V = 10 m/s when H = 5 m
Solve for k
For the additional height it travels, use conservation of energy to determine how much higher it goes when the velocity and KE goes to zero.
An upright spring which is normally 3 m is compressed 2.3 m and a 2 kg block is placed on it. When it is 5 meters above the ground it is going 10 m/s. What is the spring constant of the spring? How high will the block travel?
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