I did it backwards and entered the new spring constant k as 2979.1 Nm, plugged it into the spring calculator on the engineering website and keeping the diameters and modulus of ridgidity the same, I came up with a change in the number of active coils from 40 to 5.82.
I think there are...
disclaimer: bizarre question from physics novice
Using a smooth bore classic musket (approximately 1m length of barrel, musket ball (.0173m diameter)), what would the potential muzzle velocity of the musket ball be if the powder charge were replaced with a compressed spring?
PE=1/2kx^2...