The shift in the position of image in 1 s is
1365
1360
39
34
5
1
m
40
35
1400
1400
280
−
−
=
=
=
Therefore, the average speed of the image when the jogger is between
39 m and 34 m from the mirror, is (1/280) m s–1
Similarly, it can be seen that for u = –29 m,  –19 m and –9 m, the
speed with which the image appears to move is
 
–1
–1
–1
1
1
1
m s ,
m s
and
m s ,
150
60
10
 respectively Although the jogger has been moving with a constant speed, the speed
of his/her image appears to increase substantially as he/she moves
closer to the mirror This phenomenon can be noticed by any person
sitting in a stationary car or a bus In case of moving vehicles, a
similar phenomenon could be observed if the vehicle in the rear is
moving closer with a constant speed