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93. The object, once it is dropped (
v
0
= 0) is in freefall (
a
= –
g
= –9.8 m/s
2
if we take
down
as the –
y
direction), and we use Eq. 215 repeatedly.
(a) The (positive) distance
D
from the lower dot to the mark corresponding to a certain
reaction time
t
is given by
Δ
yD
g
t
=−
1
2
2
, or
D
=
gt
2
/2. Thus, for
1
50.0 ms
t
=
,
D
1
3
2
98
500 10
2
0 0123
=
×
=
−
..
.
m/s
s
m = 1.23 cm.
2
ch
c
h
(b) For
t
2
= 100 ms,
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This note was uploaded on 09/03/2009 for the course PHYS 1200 taught by Professor Stoler during the Spring '06 term at Rensselaer Polytechnic Institute.
 Spring '06
 Stoler
 Physics

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