A ball reaches a racket at 60 m/s along + X direction, and leaves the racket in the opposite direction with the same speed. Assuming that the mass of the ball as 50gm and the contact time is 0.02 second, the force exerted by the racket on the ball is

• A

  300 N along + X direction

• B

  300 N along - X direction

• C

  3,00,000 N along + X direction

• D

  3,00,000 N along - X direction