3-6 On a distant planet, where the gravitational field strength is 10.0 N/kg, a 6-kg 4 pts block is fired vertically by a spring gun that is initially compressed by 0.4 m.
If the maximum height that the block reaches is8.5 mabove its initial
position, what is the spring constant of the spring?
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N/m ( 20 N/m)