Question

According to Newton's 2nd law of motion, if you hit a baseball with a bat it will _____.

hurt your hand from the reaction force
accelerate according to the applied force
fly in a straight line unless an outside force changes its course
fall to the ground because of gravitational pull

Answer 1

accelerate according to the applied force

Answer 2

Newton's second law says that the acceleration of an object is produced by the force exerted on it.
Having this in mind, if you hit a baseball with a bat it will accelerate according to the applied force.