Physics 163

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 (vi) 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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