A steel ball is released from rest relative to the ground from a height of in a…

PHYSICS · Single correct · AP · Physics 1: Algebra-based · Kinematics · Kinematics

Problem

A steel ball is released from rest relative to the ground from a height of

2.0\,\text{m}

in a laboratory where

g=9.8\,\text{m/s}^2

. At the same instant, an elevator cab passes the window moving upward at a constant

3.0\,\text{m/s}

. Ignoring air resistance, what acceleration does an observer inside the elevator measure for the falling ball? (a)

12.8\,\text{m/s}^2

downward (b)

9.8\,\text{m/s}^2

upward (c)

9.8\,\text{m/s}^2

downward (d)

6.8\,\text{m/s}^2

downward