What is the kinetic energy of an object with a mass of #7 kg# that has been in freefall for #3 s#?

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Answer 1 · 2016-05-12T08:39:44

Kinetic Energy #KE=3025.26" "#joules

The given data are as follows
mass #m=7" "#kg
time #t=3" "#seconds

Assuming it starts from rest at #v_0=0#

#v_f=v_0+g*t#

#v_f=0+(-9.8)(3)#

#v_f=-29.4" "#m/sec

Kinetic Energy

#KE=1/2mv^2#

#KE=1/2*7*(-29.4)^2#

#KE=3025.26" "#joules

God bless...I hope the explanation is useful.