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2. [2pt] Pick the statement which correctly describes the acceleration, a, of the objects described below (neglecting air resistance). Select from
A: a=0 m/s^2
B: 9.81 m/s^2 down
C: a=9.81 m/s^2 up
D: a>9.81 m/s^2 down
E: a<9.81 m/s^2 down
F: a>9.81 m/s^2 up
G: a<9.81 m/s^2 up
H: Not enough information
E.g., if the first answer is A and the rest C, enter ACCCCC.
1) Just after a bullet is shot upward from a gun
2) An elevator moving downward at constant speed
3) At the top of the path of an object thrown upward
4) While a ball is in a person's hand during a downward throw
5) An elevator starting on its descent
6) While a ball is in a person's hand during an upward throw
problem 1: the italicized letters could be taken as less than -9.8 or greater than -9.8 for both! (is it less than 9.8 down, as in 5 down is less than 9.8 down or -10 is less than -9.8?)
1,2 and 3 are obviously B, 4 is D. the problem is 5 and 6
5 could be: E, D, G, H (or in extreme cases B)
6 could be: F, G, C, H
Combinations I've tried so far:
BBBDBC
*they all start with BBBD, so I'll just put 5 then 6
BF
EB
EC
EE
EF
EG
EH
HB
HH
Help... please