a body of mass 40kg walk to a step in 40. find the kinetic energy

Huh?

To find the kinetic energy of a body, you need to know its mass (m) and velocity (v).

In this scenario, we are given:
Mass (m) = 40 kg
Step (displacement) = 40 m

To calculate the kinetic energy, you also need to know the velocity (v). However, the problem statement does not provide the velocity explicitly. Without additional information, it is not possible to directly calculate the kinetic energy.

If you have information about the time taken or the acceleration during the walk, we can use more kinematic equations to find the velocity and then proceed to calculate the kinetic energy.