Question

kara and john each push their cart with the same force. why does karas cart speed up more than johns cart when they push with the same force?
a. because her cart needs no force to push it
b. because her cart has less mass
c. because her cart has more friction acting on it
d. because no gravity is acting on her cart

Explanation:

According to Newton's second - law $F = ma$ (force equals mass times acceleration). When the force $F$ is the same, the object with less mass $m$ will have a greater acceleration $a$. Kara's cart speeds up more because it has less mass.

Answer:

B. because her cart has less mass