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Q.

An object initially at a distance of 100 cm from a plane if the mirror approaches the object at a speed of  5cms-1, then after 6s the distance between the object and its image will be

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a

140 cm

b

60 cm

c

150 cm

d

170 cm

answer is B.

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Detailed Solution

Distance travelled by the mirror in 6 s = 60 cm
Now u1 = 100-30 = 70 cm
v1 = 70 cm
The distance between the object and the image is 140 cm

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