Why must an object turning in a circle be accelerating?

Because the direction of the velocity vector is changing.

Explanation:

Because velocity is a vector quantity (that is, it has both a magnitude, speed, and direction), when a body travels on a circular path, its direction constantly changes, and thus its velocity changes, producing an acceleration.

dirty, contaminated water

contaminated food,

chlostrophobic living spaces,

mice infestation,

etc,

ok, so basically your gonna start with 350 ok. so there's 60 seconds in a minute so that means you he can go up 10 ft per minute. soo, after 3 minutes he should be at 260 ft after three minutes : )