Version 082/ABBAC – QTest #3 – Antoniewicz – (56445)
1
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3
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001
10.0points
A target lies flat on the ground 10 m from
the side of a building that is 10 m tall, as
shown below.
The acceleration of gravity is 10 m
/
s
2
.
Air
resistance is negligible.
A student rolls a 10 kg ball off the horizontal
roof of the building in the direction of the
target.
10 m
10 m
v
10 m
The horizontal speed
v
with which the ball
must leave the roof if it is to strike the target
is most nearly
1.
v
=
10
√
3
3
m/s.
2.
v
= 10
√
2 m/s.
3.
v
=
√
5
10
m/s.
4.
v
= 10
√
3 m/s.
5.
v
= 5
√
2 m/s.
correct
6.
v
=
√
3
10
m/s.
7.
v
=
√
2
10
m/s.
8.
v
= 3
√
10 m/s.
9.
v
= 10
√
5 m/s.
10.
v
= 2
√
10 m/s.
Explanation:
m
= 10 kg
,
not required
h
= 10 m
,
x
= 10 m
,
and
g
= 10 m
/
s
2
.
Observe the motion in the vertical direction
only and it is a purely 1dimension movement
with a constant acceleration.
So the time
need for the ball to hit the ground is
t
=
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 Fall '08
 Turner
 Acceleration, m/s

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