The wall is on the left of the wedge...and the inclined surface of the wedge is away from the wall, with an inclination angle t.
Now suppose that the wedge moves away from the wall with accn a (towards right)... then due to the constrain of the rope, the load will move upwards along the incline with accn. a. and simultaneously, as the load is in contact with the wedge surface, it is also moving horizontally with the wedge, with accn a. So, the net accn. of the load is the vector sum of these two accn. vectors...
check ur ans... horizontal comp. of net accn of load will be (a - acost) vertical comp will be asint
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