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Ive got a mass of weight 'y' dropped onto a surface that can support 10y

there is no wind resistance

the mass starts from stationary and accelerates under gravity (assumed to be 9.8 m/s/s)

the distance is 3m

constant acceleration from stationary for s distance is v^2=2as. v^2=2(9.8)3=7.6 m/s

The kinetic energy of a particle of mass m moving at velocity v is 1/2*m*v^2 K=1/2(y)(7.6^2)=29.4y

so the particle would excede the resistance by 19.4y

with respects to the different units involved is this correct, or can i not take the resistance of the surface (measured in neutons) away from the kinetic energy of the particle (measured in joules) to get an answer because of the different units?