Answer:
30 m
Explanation:
Potential energy = kinetic energy + rotational energy
PE = KE + RE
mgh = ½ mv² + ½ Iω²
For a disk, I = ½ mr². For rolling without slipping, ω = v/r.
mgh = ½ mv² + ½ (½ mr²) (v/r)²
mgh = ½ mv² + ¼ m v²
mgh = ¾ m v²
gh = ¾ v²
h = 3v² / (4g)
h = 3 (20 m/s)² / (4 × 10 m/s²)
h = 30 m
The answer is Prove a hypothesis
I would say a because it just sounds right. I would've helped u if u had a real question question.
8 month = 5760 hours
Velocity = distance / time
v = 1800/5760 = 0.3125 mi/h
0.3125 mi/h * 1h/3600s * 5280f /mi * 0.3048 m/f = 0.1397 m/s
hope this helps