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Figure shows four situations in which a small block of mass 'm' is released from rest (with respect to smooth fixed wedge) as shown in figure. Column-II shows work done by normal reaction with respect to an observer who is stationary with respect to ground till block reaches at the bottom of inclined wedge, match the appropreate column (Assume that there is infinite friction between block and floor of cabin) :

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(A) – (p, t) ; (B) – (p, t) ; (C) – (s) ; (D) – (q, t)

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