7. While visiting the amusement park, Sarah and Sam choose to ride the bumper cars while their teacher records video of their collisions. Back in the classroom, the students analyze a head-on
collisions between Sarah and Sam's two cars. After the collision, students notice that both cars
have the same acceleration and come to rest at the same distance from the crash. What can
the students infer about the masses of the cars?

A. Their masses are equal because both momentum and kinetic energy are conserved.

B. Their masses are unequal because both momentum and kinetic energy are conserved.

C. Their masses are equal because neither momentum nor kinetic energy is conserved.

D. Their masses are unequal because neither momentum nor kinetic energy is conserved.