Physics-
General
Easy
Question
A body of mass
is resting on a wedge of angle
as shown in figure. The wedge is given at acceleration
. What is the value of a son that the mass
just falls freely?

The correct answer is: 
The horizontal acceleration
of the wedge should be such that in time the wedge moves the horizontal distance
. The body must fall through a vertical distance
under gravity. Hence,
and 
tan
or 
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