Sample Problem 3. The rear view mirror of a car is plane mirror. A driver is reversing his car at a speed of 2 m/s. The driver sees in his rear view mirror, the image of a truck parked behind his car. The speed at which the image of the truck appears to approach the driver will be:
(a) 1 m/s
(b) 2 m/s
(c) 4 m/s
(d) 8 m/s

Dear Student,

The speed of the car is 2 m/s which means the car is approaching the truck with a speed of 2 m per second. The distance between the car and truck will decrease at a double rate. This is because the image of the truck will travel a distance twice the distance traveled by car in equal time. Hence, the image of the truck will appear to approach the driver with the speed of 2 ×2 = 4 m/s.
Hence option (c) is correct.



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Is the answer 4m/s
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Yes the answer is 4 m/s. Explain pls.. I too did some calci and got 4m/s but unsure of my calci....
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