**Unit 3: Motion in
Two-Dimensions**

**Problem Set C**

**Problem 1:**

A stone is dropped from rest off the top of a 69.6-m high cliff. How much time (in seconds) does it take the stone to reach the ground below?

**TIP:**

Problem 1 involves a straight-forward calculation of time for a
one-dimensional motion. This problem is similar to those done in Unit
1 in which a kinematic equation is used to determine a fourth
quantity based upon a knowledge of three known quantities. While
there is only one stated quantity in this problem, there are two
implied ones: initial velocity (v_{i}) and acceleration.
Problem 1 serves as a pre-cursor to problems 2 and 3 in which the
stone is projected from the top of the same cliff.

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