A boy throws a cricket ball from the boundary to the wicket keeper. If the frictional force due to air f a cannot be ignored, the forces acting on the ball at the position X are represented by

Step-by-step solution

The fiction force due to air on the ball f a   will always act in the opposite direction of the velocity of the ball, and the velocity of the ball at any point on the path is always in the tangential direction of the path of the projectile. The weight of the body always acts downward perpendicular to the surface of the earth and along the centre of the earth.