A pebble is dropped from a bridge above the surface of a river

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

Problem

A pebble is dropped from a bridge

45\,\text{m}

above the surface of a river. Take

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

. The time taken by the pebble to reach the water is closest to (a)

4.5\,\text{s}

(b)

3.0\,\text{s}

(c)

2.1\,\text{s}

(d)

1.5\,\text{s}