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A child has a mass of 35 kg. The child is running across the field and has a speed of 3 m/s squared. What is the kinetic energy of the child?

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Willchemistry

KE = 1/2 mass    ( velocity )²

KE = 1/2 35 3²

KE = 17.5 * 9

KE = 157. 5 J

hope this helps!

AL2006

' 3 m/s squared ' is not a speed.  But we'll ignore the 'squared'
and handle it like a speed of 3 m/s .

           Kinetic energy  =  (1/2) (mass) (speed)²

                                     =  (1/2) (35 kg) (3 m/s)²

                                     =       (17.5 kg) (9 m²/s²)

                                     =      (157.5)  (kg-m²/s²)

                                     =          157.5 joules.

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