You serve a volleyball with a mass of 2.1 kg. The ball leaves your hand with a speed of 30 m/s. How much energy does the ball have? Physics Work and Energy Energy 1 Answer Oliver S. Apr 11, 2018 Answer: #945 J# Explanation: You have just given the ball kinetic energy, which is given by the following equation: #E_k=0.5 times m times v^2# So the energy the ball has the moment after you hit it is: #E_k=0.5 times 2.1 times (30)^2# #E_k=945 J# 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 4409 views around the world You can reuse this answer Creative Commons License