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Motion of freely falling bodies
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acceleration air resistance angle of attack angular velocity applied approach speed arm action arm movement athlete’s Centre axes axis of momentum backward balance body weight body’s Centre of Gravity clockwise counter-clockwise diﬂicult discus discus throwing distance diver eﬂiciency equal example feet ﬁeld athletics Figure ﬁnal ﬁrst ﬂexed ﬂexibility ﬂight forward rotation free leg front foot ft per second greater hammer hammer throwing hammer-head high point high-jumping hips horizontal speed hurdler hurdling impulse increase inertia inﬂuenced javelin javelin throwing jumper jumper’s Centre jumping leg kinetic energy landing lay-out leg drive leg movement leg thrust lever linear long-jumper mass maximum missile moments of inertia motion move muscles pole pole vaulting position Fig pull rear leg reduced release runner running sagittal plane shot shot putting shoulders sprinting stride suﬂicient swing take-off take-oﬂ technique thrower throwing track and ﬁeld trunk twisting upper body upward vaulter vertical velocity whole body