It requires 2,500 joules to raise a certain amount of water (c = 4.186 j/g c) from 20 c to 60 c

the entire statement is true and correct.  

there's no diagram, nothing is illustrated, and no question is asked.

the answer is the index of refraction of the second medium is higher. i just took the test.

98.4 m

explanation:

let s = distance up the plane  

then by conservation of energy  

1/2m(18.3)^2 = mg s sin(10)  

(18.3)^2 = 2g s sin(10)  

s = (18.3)^2/2gsin(10)  

= 98.39564526  

= 98.4 m