Please let justvibefam answer this ^^ Due to the fact that atoms are too small to be seen even with microscopes, scientists often use to study atoms.
A. models
B. prototypes
C. nuclear fission
D. circuits

A. models

they look at it make a model study the model.

the body's situation won't change the forces are equal opposit and on the same body

the speed of the cart after 3 seconds of low fan speed is ⇒ 54.0 cm/s.

the speed of the cart after 5 seconds of medium fan speed is ⇒ 120.0 cm/s.

the speed of the cart after 2 seconds of high fan speed is ⇒ 64.0 cm/s. 

just did the lab.