Question

The position-time graphs of two objects A and B in three different situations for a particular duration are shown as below


(i) In which situation the distance between them will remain same?
(ii) In which situation they are moving in opposite directions?Is the velocity of object A positive or negative in situation (ii)?
(iii) Are they crossing each other in any situation (s)? If so, why?
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Answer 1

(i) In the graph (iii), the distance between them will be same.

(ii)In the graph (i), they are moving in opposite directions. Velocity of object A is positive in situation (i) because the slope of s-t graph is positive.

(iii)Yes, in situations (i) and (ii) they are crossing each other because in these two cases, the s-t graph of A and B intersect each other.