1
This printout should have 8 questions.
Multiplechoice questions may continue on
the next column or page – fnd all choices
beFore answering.
This assignment is due October 19th (Mon
day) at 10 pm. Solutions immediately Follow.
001
(part 1 oF 3) 10.0 points
A block starts at rest and slides down a Fric
tionless track. It leaves the track horizontally,
±ies through the air, and subsequently strikes
the ground.
b
b
b
b
b
b
b
b
b
b
b
b
579 g
4
.
2 m
2
4 m
x
v
What is the speed oF the ball when it leaves
the track?
The acceleration oF gravity is
9
.
81 m
/
s
2
.
Correct answer: 5
.
94273 m
/
s.
Explanation:
Let :
g
=

9
.
81 m
/
s
2
,
m
= 579 g
,
and
h
1
= 1
.
8 m
.
b
b
b
b
b
b
b
b
b
b
b
b
m
h
1
4
.
2 m
v
Choose the point where the block leaves the
track as the origin oF the coordinate system.
While on the ramp,
K
b
=
U
t
1
2
m v
2
x
=

m g h
1
v
2
x
=

2
g h
1
v
x
=
r

2
g h
1
=
R

2 (

9
.
81 m
/
s
2
) (1
.
8 m)
=
5
.
94273 m
/
s
.
002
(part 2 oF 3) 10.0 points
What horizontal distance does the block
travel in the air?
Correct answer: 4
.
15692 m.
Explanation:
Let :
h
2
=

2
.
4 m
.
With the point oF launch as the origin,
h
2
=
1
2
g t
2
t
=
±
2
h
2
g
.
Thus
x
=
v
x
t
=
v
x
±
2
h
2
g
= (5
.
94273 m
/
s)
±
2 (

2
.
4 m)

9
.
81 m
/
s
2
=
4
.
15692 m
.
003
(part 3 oF 3) 10.0 points
What is the speed oF the block when it hits
the ground?
Correct answer: 9
.
f
=

m g h
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 Spring '09
 weathers
 mechanics, Conservation Of Energy, Energy, Kinetic Energy, Potential Energy, Power, Work, Correct Answer

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