Answer:
I think they use it at night because they want to avoid involving themselves in road accident while crossing the street. When there are reflective strips on their clothes, drivers do notice them even at far ends of the street since the strips will reflect the rays from the car lights to the driver,hence, the driver notifies that there is a pedestrian crossing and therefore slows down.
Answer:
a dog walking or their phone rings or heard a neighbor talking to them
F = G*((m sub 1*m sub 2)/r^2)
B is you answer sorry i dont quite know how to explain it in a way that you and anybody else would understand it.
