A small block of mass m rests on a smooth wedge of angle θ . With what horizontal acceleration ‘a’ should the wedge be pulled, as shown in Fig., so that the block falls freely?
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a
g cos θ
b
g sin θ
c
g cot θ
d
g tan θ
answer is C.
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Detailed Solution
mgcosθ=masinθa=gcotθWhen it will loose the contact it becomes a freely falling body i.e., normal reaction will be zero.