What is the kinetic energy of an object with a mass of #3 kg# that has been in freefall for #4 s#?

1 Answer
Dec 30, 2015

Answer:

The kinetic energy of the object is #K=2310N#

Explanation:

You know that the formula of kinetic energy is #K=1/2mv^2#
At #t=0# #v=0#, so after #4s# the speed of the object will be #v=at=9.81m/s^2*4s=39.24m/s#
So #K=2310N#