# Physics

If you drop a 1.0 kg weight from a height of 1.0 m, how many joules of kinetic energy will it have when it reaches the ground?

Can I use the equation for work: W = F*s to find the kinetic energy?
Or would I have to find the velocity of the weight as it falls because I'm not sure how to do that.

1. You can do it either way.
The work done (by gravity) is
M*g*H = 9.8 Joules
That equals the final kinetic energy.

Vfinal = sqrt(2 g H)
(1/2)M*Vfinal^2 = M g H

posted by drwls
2. 48.02J

posted by ty

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