As an example, consider a person walking. In the middle of the pitch, where one foot rests on the ground, and the other thrown forward and hangs in the air, the body continues to move forward by inertia after the previous step. To the remaining kinetic energy is added to the new portion of it, when a man straightens his leg at the knee and the ankle, thus lengthens it and pushes the body forward. As a result, the body loses its balance, and the other foot hanging in the air, must be lowered to the ground for support. This movement is in large part suppresses the translational speed. The action of forces directed forward and upward, can be represented as vectors, one of which will display the true forward motion speed or a human (see. Fig. At p. 232-233).
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