Given,

Mass m = 50 kg

Velocity = 50 cms^-1

1 cm = 0.01 m

So, velocity = 50 ×0.01 ms^-1

v = 0.5 ms^-1

We know,

Kinetic energy = m v²

Substituting value of m and v in the equation:

Kinetic energy =

= kgm²s^-2

= 6 J