What is the kinetic energy of an object with a mass of #15 kg# that has been in freefall for #18 s#? Physics Work and Energy Energy 1 Answer ali ergin May 11, 2016 #E_k=2.3385372*10^5J# Explanation: #h=1/2*g*t^2# #E_k:"the kinetic energy of object"# #E_p:"the potential energy of object"# #E_k=E_p# #E_k=m*g*h# #E_k=m*g*1/2*g*t^2# #E_k=1/2*m*g^2*t^2# #E_k=1/2*15*(9.81)^2*18^2# #E_k=233853.72 J# #E_k=2.3385372*10^5J# 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 1327 views around the world You can reuse this answer Creative Commons License