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Grade 12th pass9 grade science

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 ________________.

Profile image of Harshit Singh
4 Years agoGrade 12th pass
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1 Answer

Profile image of Yash Patari
4 Years ago
DEAR STUDENT

 

When the object moves with speed u towards (or away) from the plane mirror then image also moves toward (or away) with speed u. But relative speed of image w.r.t. object is 2u.

 

Given,

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, therefore

speed of the object in mirror = 2v=2×2=4 m/s.

Therefore, the answer is option(iii) i.e., 4 m/s.

THANKS