You and your younger sister (who weighs half as much you do) are at a skating rink. You are both wearing roller skates and are facing each other. What will happen to your and your sister's motion if you push against each other You move forward and your sister moves backward at a faster rate.

You both move forward, but you accelerate at a greater rate.

You move backward and your sister moves forward at a faster rate.

You both move backward but your sister accelerates at a greater rate