Q.

Work done by force of friction :
(i) can be positive 
(ii) can be negative
(iii) can be zero 
(iv) any of the above

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a

(i, iv)

b

(i, ii)

c

(i, iii, iv)

d

(i, ii, iii, iv)

answer is A.

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Detailed Solution

Work done by friction can be positive, negative or zero.

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Work done by force of friction :(i) can be positive (ii) can be negative(iii) can be zero (iv) any of the above