A large rectangular box 
falls vertically with an acceleration a. A toy gun fixed at A and aimed towards C fires a article P.
A
P will hit C if 
.
,
. ,
B
P will hit the roof BC if 
.
or
. or
C
P will hit the wall CD or the floor AD if 
.
, depending on the speed of projection of P.
. , depending on the speed of projection of P.
D
May be either
Text Solution
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(a, b, c): Superimpose an upward acceleration a on the system. The box becomes stationary. The particle has an upward acceleration a and a downward acceleration g. If a = g, the particle has no acceleration, and if a > g, the particle has a net upward acceleration, and if a < g, the particle has a net downward acceleration.
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