Question

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​

Answer 1

Answer:

Correct option is (ii) 2m/s.

As the car moves 2m backward, the mirror also moves 2m backward, so the image comes 2m forward.

Answer 2

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.