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
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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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