A paraplegic patient weighing 70kg is sitting on the floor and is exercising the elbow and shoulder muscles with the aid of a push-up chair (top picture). The portion of the body weight transmitted through the heels, determined by means of a force plate, is 100N, acting vertically. The patient exerts a vertical force on the handgrips, equally distributed between the two hands. Only the heels and hands are supported. How large is the torque (M) on the elbow joint if the moment arm of the force relative to the point of grip in the hand is 0.05m? Disregard the weight of the forearm