Question

why does the girls body lurch forward, and at the same, time what happens to the skateboard?
a. the back end of the skateboard flipped up, pushing the girl forward.
b. the part of the sidewalk the girl was skating toward was higher than the part behind her, causing her to fall forward.
c. the girl was stopped by the bump, but the skateboard continued to move forward.
d. the skateboard was stopped by the bump, but the girl continued to move forward.

Explanation:

According to Newton's first law of motion (the law of inertia), an object in motion will stay in motion unless acted upon by an external force. In this case, the skateboard hits the bump (an external force) and stops, while the girl's body, which was in motion with the skateboard, continues to move forward due to inertia.

Answer:

D. The skateboard was stopped by the bump, but the girl continued to move forward.