28. Let A vector be a unit vector along the axis of rotation of a purely rotating body and B vector be a unit vector along the velocity of a particle P of the body away from the axis. The value of A vector X B vector is
(a) 1
(b) – 1
(c) 0
(d) None of these
Ans. c
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a