What is the kinetic energy of an object with a mass of 3 kg that has been in freefall for 7 s? Physics Work and Energy Energy 1 Answer ali ergin May 19, 2016 E_k=7073.35" "J Explanation: "first; let's find velocity of object for t=7" v=-g*t v=-9*81*7 v=-68.67 m/s "The Kinetic Energy of an object is calculated by:" E_k=1/2*m*v^2 m=3 kg E_k=1/2*3*(-68.67)^2 E_k=7073.35" "J Answer link Related questions How do matter and energy interact? Question #50ca2 Question #242cf Question #5038d Question #50391 What is potential energy? Question #d6576 Question #50cae Question #50cb2 Question #50cb6 See all questions in Energy Impact of this question 1409 views around the world You can reuse this answer Creative Commons License