Home
Class 11
PHYSICS
A car is fitted with a convex side-view ...

A car is fitted with a convex side-view mirror of focal length `20 cm` `A` second car `2.8 m` behind the first car is overtaking the first car at a relative of `15 m//s`. The speed of the image of the second car as seen in the mirror of the first one is :

A

`1/15 m//s`

B

`10m//s`

C

`15m//s`

D

`1/10m//s`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Similar Questions

Explore conceptually related problems

A car is fitted with a convex side-view mirror of focal length 20 cm. A second car 2.8m behind the first car is overtaking the first car at a relative speed of 15 m/s . The speed of the image of the second car as seen in the mrror of the first one is:

A convex, rearview mirror of focal length 20cm, is fitted in a car. A second car 2 m broad and 1.6m high is 6m away from the first car and overtakes the first car at a relative speed of 15 ms^(-1) , then the speed of the first car is

A car 2 m long travelling at 30 ms^(-1) overtakes another car 4 m long travelling at 20 ms^(-1) . The time taken by the first car to pass the second car is

Why are convex mirrors used as side view mirrors in cars ?

A thief is running away in a car with velocity of 20 m//s . A police jeep is following him, which is sighted by thief in his rear view mirror, which is a convex mirror of focal length 10 m. He observes that the image of jeep is moving towards him with a velocity of 1 cm//s . if the magnification of mirror for the jeep at that time is 1/10 . Find (a) the actual speed of jeep, (b) rate at which magnification is changing. Assume the police's jeep is on the axis of the mirror.

A thief is running away in a car with velocity of 20 m//s . A police jeep is following him, which is sighted by thief in his rear view mirror, which is a convex mirror of focal length 10 m. He observes that the image of jeep is moving towards him with a velocity of 1 cm//s . if the magnification of mirror for the jeep at that time is 1/10 . Find (a) the actual speed of jeep, (b) rate at which magnification is changing. Assume the police's jeep is on the axis of the mirror.

An object, a convex lens of focal length 20 cm and a plane mirror are arranged as shown in the figure. How far behind the mirror is the second image formed?

A car travels the first half of a distance between two places a speed of 30 km/hr and the second half of the distance a 50 km/hr. The average speed of the car for the whole journey is

A car travelling towards a hill at 10 m//s sound its horn which a frequency 500 H_(Z) . This is heard in a second car travelling behind the first car in the same direction with speed 20 m//s . The sound can also be heard in the second car by reflections of sound the hill. The beat frequency heard by the driver of the sound car will be (speed of sound in air = 340 m//s)

A car moves a distance of 100 m. It coveres first half with speed of 10 m/s and another half with speed of v m/s. If the average speed of car is 18 m/s, then value of v is