B) not work ,because the water would freeze
Answer: 
Explanation:
Given
Length of the race track 
the radius of curvature of the track 
time taken to run on track is 
Speed of runner is

Centripetal acceleration is

Answer:
use hot water
Explanation:
hot water helps dissolve things faster
The Soviet Union's Sputnik 1, it was launched October 4th 1957.