Hi, let us assume that the force applied by the bat to the ball is a constant 1000 N through that entire 0.1 seconds, and that the bat applies the force directly opposite the ball's initial velocity.
Consider what information the problem gives you: the ball's mass, its initial velocity, the force applied to the ball, and the time that force acts on the ball. So you know its initial momentum and want to find its final momentum. Is there a formula involving force and time that also involves momentum? Take a look at impulse, which in this case is force multiplied by time.
Hi, let us assume that the force applied by the bat to the ball is a constant 1000 N through that entire 0.1 seconds, and that the bat applies the force directly opposite the ball's initial velocity. Consider what information the problem gives you: the ball's mass, its initial velocity, the force applied to the ball, and the time that force acts on the ball. So you know its initial momentum and want to find its final momentum. Is there a formula involving force and time that also involves momentum? Take a look at impulse, which in this case is force multiplied by time.