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Q.

Figure shows four situation in which a small block of mass ‘m’ is released from rest (with respect to smooth fixed wedges) as shown in figure. Column-II shows work done by normal reaction on the block (with respect to an observer who is stationary on ground) till block reaches at the bottom of inclined wedge, match the appropriate column.
Column-I Column-II
A
P Positive
B
Q Negative
C
R Equal to mgh in magnitude
D
S Equal to zero

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a

$A - P; B - P; C - S; D - Q$

b

$A - P; B - P; C - Q; D - S$

c

$A - P; B - Q; C - Q; D - S$

d

$A - P; B - P; C - P; D - Q$

answer is B.

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Figure shows four situation in which a small block of mass ‘m’ is released from rest (with respect to smooth fixed wedges) as shown in figure. Column-II shows work done by normal reaction on the block (with respect to an observer who is stationary on ground) till block reaches at the bottom of inclined wedge, match the appropriate column. Column-I Column-IIAPPositive BQNegativeCREqual to mgh in magnitude DSEqual to zero