7. The resultant of two forces and is R. If the first force is doubled then the resultant is also doubled. The angle between the two forces is
(a) 60 ° (b) 120°
(c) 70 ° (d) 180°
Ans. b
(8)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)