PHYSICS 1306, QUIZ 2
Chapter 3
February 7, 2003
Partial credit will be liberal, provided you show your work!
USE BACK IF NECESSARY!
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1. (20 points) A ball is thrown horizontally from the roof of a building h = 75 m
tall. It lands on the ground, a distance d = 55m from the base of the building, as
is shown in the figure.
a. What is the ball’s acceleration (magnitude and direction) throughout its trip?
O
v0
h
b. How long does it take the ball to hit the ground?
y
c. What was the ball’s initial velocity v0?
d. What was the vertical (y component) of velocity vy just before it hit the ground? What
was its horizontal (x component) of velocity vx at that same time?
e. 5 POINT BONUS!!!! What were the magnitude v and direction  of the ball’s velocity
vector just before it hit the ground?
2. (10 points) An airplane is traveling with a velocity v = 785 km/h in a direction
38.5º West of North (see the figure).
a. Find the components of the velocity vector in the Northerly and Westerly
directions.
b. How far North and how far West has the plane traveled after a time t = 3.0 h?
x