Homework Help: science

Posted by aaaa on Monday, January 9, 2012 at 6:34am.

A big plane mirror is fixed vertically on the back of bicyce. A boy standing in front of the
mirror can see his image clearly in the plane mirror. The bicycle starts moving with the
sepeed of 6 ms–1 and the boy also starts running with 4 ms–1 in the direction of bicycle
motion to keep his image in the plane mirror.
(i) What is the speed of boy with respect to bicycle?
(ii) What is the speed of image in plane mirror with respect to boy.
(iii) Will the size of the image increase, decrease or remain thee same.

science - drwls, Monday, January 9, 2012 at 7:34am
(i) 10 m/s
(ii) 20 m/s

(iii) Image size will increase, until they collide or pass each other
science - Steve, Monday, January 9, 2012 at 12:12pm
seems to me that since the mirror is on the back of the bicycle, the boy is chasing the bike, but losing ground at 2m/s.

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