A train of weight, 3.7x106 N is moving at a speed of 40.8 m/s. Determine its Kinetic energy ? Physics Work and Energy Energy 1 Answer Donatello N. · Trevor Ryan. Oct 29, 2015 #314,24MJ# Explanation: #E_k=1/2mv^2# #=1/2(W/g)v^2# here W is the weight of the train, so that we could calculate for its mass inserting the variables, #=1/2((3,7xx10^6)/(9,8))(40,8)^2# #=314,24MJ# 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 2202 views around the world You can reuse this answer Creative Commons License