Need help doing sum impact force on physics

Does this code correctly gives an impact force? I’m new to programming so let me know nay monstrosities you see in my code.

extends CharacterBody2D

var gravity = 980
var weight = 0
var mass = 0.10

#Force on impact
var last_velocity = Vector2.ZERO
var force = 0

var seconds = 0

func _physics_process(delta: float) → void:
if not is_on_floor():
velocity.y += gravity * delta
#This is the falling time, Maybe not real seconds but workds as a timer.
seconds += 1 * delta
#This gets the last velocity when it colides with the floor
last_velocity = get_real_velocity()
else:
#Impact force… I guess
force = (mass * last_velocity) / seconds
print(force.y)
velocity.y = 0
seconds = 0

move_and_slide()

It actually doesn’t . I need to find a way to get the last velocity when the object collides with the floor.