annie has a soccer ball and a kickball. she kicks each ball with the same force. the soccer ball accelerates…

Brief Explanations:

According to Newton's second - law $F = ma$ (where $F$ is force, $m$ is mass, and $a$ is acceleration). Since the force $F$ is the same for both balls, and $a=\frac{F}{m}$, a smaller mass results in a greater acceleration. So the kickball must have a smaller mass than the soccer ball.

Answer:

The kickball has a smaller mass than the soccer ball because, according to Newton's second - law ($F = ma$), when the force is the same, a smaller mass leads to a greater acceleration.