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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



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


Grade:11

3 Answers

Navjyot Kalra
askIITians Faculty 654 Points
10 years ago

(iii) 4 m/s

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.

Kushagra Madhukar
askIITians Faculty 628 Points
3 years ago
Dear student,
Please find the answer to your question.
 
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.
 
Thanks and regards,
Kushagra
Janarth
92 Points
3 years ago
 
 

(iii) 4 m/s

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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