54. The r.m.s. speed of a group of 7 gas molecules having speeds (6, 4, 2, 0, – 2, – 4, – 6) m/s is
(a) 1.5 m/s (b) 3.4 m/s
(c) 9 m/s (d) 4 m/s
Answer-d
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a