How can I get force value for a rigidbody ?

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1

Hello,everyone! my English is not good,hope you can understand my means. I want to get force for a rigidbody. For example, punch a person, the person will get how much force.

2 
force = mass * acceleration

and

acceleration = (velocity - oldVelocity) / time

so, it should be something like this:

float oldMag = 0.0F;

void Update()
{
    float curMag = rigidbody.velocity.magnitude;
    float accel = (curMag - oldMag) / Time.deltaTime;
    float force = rigidbody.mass * accel;
    print ("The force on " + this.name + " is: " + force);
    oldMag = curMag;
}