If an object with a mass of #2 kg # changes speed from #3 m/s# to # 4m/s#, by how much does its kinetic energy change? Physics Work and Energy Energy 1 Answer P dilip_k Apr 8, 2016 The change in KE-#=1/2xxm(v_2^2-v_2^2)=1/2xx2(4^2-3^2)J=7J# 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 1376 views around the world You can reuse this answer Creative Commons License