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Question 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
(i) 1 m/s
(ii) 2 m/s
(iii) 4 m/s
(iv) 8 m/s
Question 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
(i) 1 m/s
(ii) 2 m/s
(iii) 4 m/s
(iv) 8 m/s
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Solution
speed of the car, v = 2 m/s
Since the image of the truck will travel a distance twice the distance travelled by the car in equal time,
speed of the object in mirror = 2v = 2×2 = 4 m/s.
Therefore, the answer is option(iii) i.e., 4 m/s.
speed of the car, v = 2 m/s
Since the image of the truck will travel a distance twice the distance travelled by the car in equal time,
speed of the object in mirror = 2v = 2×2 = 4 m/s.
Therefore, the answer is option(iii) i.e., 4 m/s.
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