A girl who weighs 30 kg is inline skating at a speed of 5 m/s. What is the girl's kinetic energy?

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Answer 1 · 2016-05-23T10:05:34

Kinetic energy of girl is #375 J#

We can find kinetic energy of anybody/particle by plugging its mass and velocity in Kinetic energy equation

#K=1/2mv^2#

Where,

#K# is kinetic energy of object
#m# is mass of object
#v# is velocity of object

For this case mass of girl is #30 kg#
Her velocity is #5m/s#

According to equation

#K=1/2mv^2#

#K=1/2*30*(5)^2#

#K=1/2*30*25#

#K=375 J#

Kinetic energy of girl is #375 J#