The rear view mirror of a car is a plane mirror. A driver is reversing his car at a speed of 4 m per second. The driver sees, in his rear view mirror, the image of a scooter parked behind his car. The speed, at which its image appears to approach the driver, will be what among the following options-
a) 2 metre per second
b) 4 metre per second
c) 8 metre per second
d) 16 metre per second

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Solution

The correct answer is C. 8 m/s
The speed of the car is 4 m/s which means the car is approaching the scooter with a speed of 4 m per second. The distance between the car and the scooter will decrease at a double rate. This is because the image of the truck will travel a distance twice the distance travelled by car in equal time. Hence, the image of the scooter will appear to approach the driver with the speed of 2 × 4 = 8 m/s.

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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
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