question_answer

Two persons are pulling, the ends of a string in such away so that the string is stretched horizontally. When a weight of 10 kg is suspended in the middle of the string, the string does not remain horizontal. Can the persons make it horizontal again by pulling it with a greater force?

Answer:

                (a) In this case two vectors must be in the same direction i.e. \[\vec{A}\]is in the direction of \[\vec{B}\] (b) In this case, \[\vec{B}\]must be zero, (c) \[\vec{A}\]should be perpendicular to\[\vec{B}\].