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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?

Respuesta :

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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