# Physics

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As a block of wood with the mass of 2.00 kg slides along a floor, it's speed decreases from 4.0 m/s to 1.0 m/s. How much kinetic energy does it lose?

• Physics -

Kinetic energy is defined with
K = 1/2*m*v^2

so you have Kf - Ki

[1/2(m)(vf)^2] - [1/2(m)(vi)^2] =

m = mass
v = velocity; f for final, i for initial
which is the developed way of writing Newtons because 1 kg * m/s^2 = 1 N

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