Velocity a vector quantity, is the speed that has a specific direction.
Examples: 8 m/s to the East 20000 km/h Northwest
My car is running at a speed of 40 mi/h going North to my school.
In the question it is already given that the football player is 80 kg. Then the mass of the football player = 80 kg Velocity at which the football player is running = 8 m/s Kinetic Energy = 0.5 • mass • square of velocity Now we have to put the known data in this equation to find the actual velocity of the footballer. So Kinetic Energy of the footballer = 0.5 * 80 * (8 * 8) = 0.5 * 80 * 64 = 2560 So the Kinetic energy of the footballer is 2560 joules
