A block of mass 
is stationary with respect to a rough wedge is shown in figure. Starting from rest in time 
. Match the following columns for work done on the block.
Column I | Column II |
A. By gravity | I. 144 J |
B. By normal reaction | II. 32 J |
C. By friction | III. -160 J |
D. By all the forces | IV. 48 J |
Choose the correct answer from the options given below.
Text Solution
Verified by ExpertsB
and 
From work-energy theorem,
Work done by all the forces 
Work done by gravity,
Writing equation of motion, we have
or 
…(i)
…(ii)
Solving Eqs. (i) and (ii), we have
Now, work done by normal reaction, 
Work done by friction,
Work done by all the forces,
Hence, A 
III, B 
I, C 
IV, D 
II.
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