Question

A roller coaster has a mass of 250 kg. It drops from rest at the top of a hill that's 88 m tall. How fast is it going when it reaches the bottom? Acceleration due to gravity is g = 9.8 m/s2.

A.41.5 m/s B.13.1 m/s C.52.2 m/s D.70.0 m/s

Answer 1

41.5

Step-by-step explanation:

finished test

Answer 2

v² = u² + 2gs

from rest u = 0, g = 9.8 m/s², s = 88m

v² = 0² + 2*9.8*88

v² = 1724.8

v = √1724.8

v ≈ 41.5 m/s

Option A.