Your family is moving, and you are asked to help move some boxes. One box is so
heavy that you must push it across the
room rather than lift it. What are some
ways you could reduce friction to make
moving the box easier?

there are no contact forces mentioned on the list of choices that you've provided.

i really dont know but i will try okay.

so i think u would just add all them up and get your answer..

b. false

explanation:

suppose a rock in free fall is dropped off a cliff. after falling for 5 seconds, its speed would not be 100 m/s.