Question

The relative speed of a car is 20km/h relative to an observer moves at speed of 40 km/h in the same direction, so the actual speed of this car is...........................km/h

Answer 1

Answer:

your answer

Explanation:

The mirror is moving at speed V

2

=70 km/h along with the truck.

So, The truck seen the can approaching towards it with velocity,

relative velocity of can wrt to truck =V

1/2

=V

1

−V

2

=50−70

=−20 km/h

So for the mirroe Object velocity is =−20 km/h and so for a plane mirror, image velocity be =−V=20 km/h.

As the mirroe itself moving with velocity V

2

=70 km/h

The observer sees the velocity of image of can as :

V

′

=V

2

−V

1/2

=90 km/h

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