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Answered 2010-02-21 11:38:20
Kinetic energy

The formula for kinetic energy, Ek, could not be simpler.

Ek = (1/2)mv2, where m is mass (in kg) and v is velocity (in m s-1). If you prefer, you could write Ek = mv2/2.

or, 810j=1/2*20Kg*v2

or,v2=810j*2/20Kg

or,v=sqrt of 81

so,v=9m s-1

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