21. The correct relation is
(a) r= 2T cos θ/hdg
(b) r= hdg/2T cos θ
(c) r= 2T dgh/cos θ
(d) r= T cos θ/2hdg
(14)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)