The diagram below shows a paper clip in front of a mirror. where will the image of the paper clip appear to the observer? 1 2 3 4

As per the property of plane mirror the image of an object always forms in front of mirror at same distance as that of distance of object.

Also the distance must be measure perpendicular from the mirror

so here the perpendicular position of clip from mirror is to find out so that its image it to be locate behind the mirror at same distance

Here image is always virtual to position must be behind the mirror

so the correct position of the pin image must be position 3

so correct answer here is

3

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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