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Match the Column I with Column II and mark the correct choice from the codes given below.
Column-I Column-II
(i) When a body does work against friction its kinetic energy (p) Independent of time
(ii) Work done by a body is (q) Time
(iii) Power of a body varies inversely as r) Force must be conservative
(iv) When work done over a closed path is zero (s) Decreases
Codes

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i-s, ii-p, iii-q, iv-r

i-r, ii-p, iii-q, iv-s

i-s, ii-q, iii-p, iv-r

i-p, ii-q, iii-r, iv-s

answer is D.

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Detailed Solution

When a body does some work against friction, its kinetic energy decreases

(i) - s

Work done by a body independent of time.

(ii) - p

Power of a body ( $ρ = W / t$ ) varies inversely as time

(iii) - q

When work done over a closed path is zero, fore must be conservative

(iv)-r

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