Speed in a specific direction

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