An object is in motion when
a. you observe the object move.
b. the object s speed increases.
c. the object s displacement is greater than the distance traveled.
d. the object changes position relative to a stationary reference point.

While goofing off at the ice skating rink, a student takes off her shoes and places each of them on the ice. her friend, a hockey player, then shoots a hockey puck at each shoe. the first puck immediately comes to rest after it collides with the left shoe. the second puck rebounds after it collides with the right shoe. if each hockey puck has the same incoming speed, which shoe has greater speed after the collision? the right shoe. both shoes have the same speed. the left shoe.

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?