13. The rear view mirror of a car is a 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
(1) I m/s
(ii) 2 m/s
(iii) 4 m/s
(iv) 8 m/s
How??
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Answer: ⤵️
(iii) 4 m/s
Explanation: ⤵️
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 travelled by the 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.
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