A small block slides in a vertical circular trajectory along the inside of a frictionless surface. There is nothing else in contact with the block and it is moving at the instant shown. Which arrow may represent the net force at this moment? a) A b) B c) C d) D e) more than one of the arrows may represent the net force vector

A small block slides in a vertical circular trajectory along the inside of a frictionless surface. There is nothing else in contact with the block and it is moving at the instant shown. Which arrow may represent the net force at this moment? a) A b) B c) C d) D e) more than one of the arrows may represent the net force vector