Question

Draw position-time graph of two objects,A and B moving along straight line, when their relative velocity is (1) zero (2) positive

Answer 1

(1) If the relative velocity is zero, both A and B appear to be in stationary at a particular time but at a different displacement. Hence the graph looks like two parallel lines.

$\setlength{\unitlength}{1mm}\begin{picture}(5,5)\put (0,0){\vector(1,0){30}}\put (0,0){\vector(0,1){30}}\put(0,5){\line(2,1){30}}\put(0,10){\line(2,1){30}}\put(32,-2){ t }\put(-2,32){ x }\end{picture}$

(2) If the relative velocity is positive, either A or B appears to move faster than other and may overtake it, so the graph shows two straight lines with different slope.

$\setlength{\unitlength}{1mm}\begin{picture}(5,5)\put (0,0){\vector(1,0){30}}\put (0,0){\vector(0,1){30}}\put(0,5){\line(1,1){25}}\put(0,10){\line(2,1){30}}\put(32,-2){ t }\put(-2,32){ x }\end{picture}$

Answer 2

Answer:

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