The accompanying figure shows a frictionless channel in the shape of a segment of a circle with center at "O". The channel has been anchored to a frictionless horizontal tabletop. You are looking down at the table. Forces exerted by the air are negligible. A ball is shot at high speed into the channel at "p" and exits at "r." Consider the following distinct forces: 1. A downward force of gravity. 2. A force exerted by the channel pointing from q to O. 3. A force in the direction of motion. 4. A force pointing from O to q. O 1 only. Which of the above forces is (are) acting on the ball when it is within the frictionless channel at position "q"? O 1 and 2. O 1 and 3. O 1, 2, and 3. q O 1, 3, and 4. r

The accompanying figure shows a frictionless channel in the shape of a segment of a circle with center at "O". The channel has been anchored to a frictionless horizontal tabletop. You are looking down at the table. Forces exerted by the air are negligible. A ball is shot at high speed into the channel at "p" and exits at "r." Consider the following distinct forces: 1. A downward force of gravity. 2. A force exerted by the channel pointing from q to O. 3. A force in the direction of motion. 4. A force pointing from O to q. O 1 only. Which of the above forces is (are) acting on the ball when it is within the frictionless channel at position "q"? O 1 and 2. O 1 and 3. O 1, 2, and 3. q O 1, 3, and 4. r