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The rearview of a car is a plane mirror . A driver is reversing his car at a speed of 2metre per second. The driver sees in ihs rearview mirror the image of a truck parked behind his car. What will be the speed at which the image of the truck appears to approach the driver??

i wud like an expert to answer thid question..

IN A PLANE MIRROR, THE OBJECT AND ITS IMAGE ALWAYS REMAIN AT THE SAME DISTANCE.SO,WHEN THE CAR REVERSES AT A SPEED OF 2M/SEC. THEN THE IMAGE WILL ALSO APPEAR TO MOVE TOWARDS THE MIRROR AT THE SAME SPEED OF 2M/SEC.SO,THE SPEED AT WHICH THE IMAGE OF TRUCK APPEARS TO APPROACH   THE CAR DRIVER WILL BE 2M/SEC.+2M/SEC.=4M/SEC.

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 2 meters per second my friend

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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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