The hammer throw was originally thrown with a sledge hammer, but as the sport developed people made the implement more effective by putting the weight as far away from the thrower as possible without violating the rules of the hammer's meassurements. The thrower's bodyweight counters the hammer head's weight (caused by the centrifugal force created by the moving of the implement) making a circulare motion. If the radious is larger (the implement's centre of gravity is as far away from the rotational axis as possible) a longer throw will be produced.
The weight used is 4 kg
The weight of the hammer is 16 pounds. For high school and master's competition it is 12 pounds.
Hammers are specified by head style and weight.
You can buy special scales, that can tell you the percentage of body fat and muscle.
With a scale
The men's hammer weighs 7.257 kg (16 lbs) and the women's hammer weighs 4 kg (8.82 lbs).
Her actual weight is 75 pounds
Not actual "weight" weight. If they did lose any weight, it would just be water weight, and wouldn't be actual fat loss.
In 1843-- steam raised the hammer, but the weight of the hammer was the only pressure used to shape the metal. By 1888, a double-acting hammer used steam to supplement the pressure exerted by the falling hammer.
There are many different types of hammer for many different purposes, but if you are referring to a regular carpenter's claw hammer, then the recommended weight of hammer head to use for most purposes is 20 ounces (about half a kilo). For lighter work, for example driving home panel pins and small tacks, a lighter hammer head of 16 ounces is recommended.
The answer will depend on what attribute of the hammer: its mass, weight, length, etc you wanted to measure.