* A boy observes a piece of stone at the bottom of a river 60 m deep. It he looks vertically from the surface of the river, how far does the stone appear to be from him?
[Refractive index of water
A. 80 m
B. 4.5 m
C.6.0 m
D. 5.5 m

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

your answer is c! hope this : )

report!

explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."