PHYSICS 1403-003 (MWF), QUIZ 2, Chapter 3, February 4, 2005
Partial credit will be liberal, provided that you show your work!
USE BACK IF NECESSARY! NOTE: You have about 15 minutes to do this quiz! So pace yourself!
Name: ______________________
1. (30 points) See figure. A ball is thrown horizontally with initial velocity v0, from
the roof of a building of height h. (Note: This obviously means that vx0 = v0 and vy0
= 0). It lands on the ground a distance d = 65 m from the base of the building. It
takes a time t = 4.0 s to hit the ground.
O
v0
h
a. Compute the height h of the building.
y
b. Compute the initial velocity v0, of the ball.
c. Compute the vertical (y component) of velocity vy just before the ball hits the ground.
What was its horizontal (x component) of velocity vx at that same time?
d. Compute the length (magnitude) of the velocity vector v and the angle θ it makes with
the x-axis just before the ball hits the ground.
e. Compute the ball’s x and y components of velocity, vx and vy at a time t = 2.0 s after it is
thrown.
f.
x
5 POINT BONUS! Compute the length (magnitude) of the velocity vector v and the
angle θ it makes with the x-axis at a time t = 2.0 s after it is thrown.
d
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