What is the central idea of paragraph 3? O A. Learning about roller coasters is a fun and
efficient way for students to experience how
potential and kinetic energy work.
OB. Students can easily figure out the kinetic
energy of a roller coaster car they know the
weight and height of the car off the ground.
C. Roller coasters display potential energy when
the car is at the top of the hill and kinetic
energy when it is rushing down the hill.
O D. Students should be excited about all the
potential energy there is when their car pauses
at the top of the hill of a roller coaster.

When a pair of 10-n forces act on a box of candy, the net force on the box is a 20 n. b about 14 n. c zero. d any of the above depending on the directions of forces.

What kind of waves require a medium to travel? question 6 options: light waves mechanical waves all waves need a medium to travel electromagnetic waves

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?