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(A) The centre of mass of the system is subjected only to the external gravitational force acting downwards.Internal forces,such as the man throwing t

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(A) The centre of mass of the system is subjected only to the external gravitational force acting downwards.Internal forces,such as the man throwing the ball or the ball bouncing off the walls,do not affect the motion of the centre of mass of the system.According to Newton's second law for a system of particles,$F_{ext} = M_{total} \cdot a_{cm}$.Since the only external force is gravity,the acceleration of the centre of mass is $g$ directed downwards.Therefore,the centre of mass will move in a straight vertical line downwards,as depicted in Figure $A$.

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