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The speedometer of a car moving to the east reads 100km per hr and it passes another car that moves to the west at 100km per hr so do both cars have the same speed please explain?
Wiki User
∙ 15y ago
This is an ideal vehicle for explaining the concept of frame of reference. The speed of each car depends upon the frame of reference from which you measure it. If you take a stationary position at either car's starting point, you will measure the speed of the car coming toward you at 100 km/hr. You will also measure the speed of the approaching car at 100 km/hr. So relative to the ground they are traveling on, each is moving at 100 km/hr. However, if you put yourself in either of the cars, you measure the speed of the other car relative to your own position, the you will see the other car approaching you at 200 km/hr. It's important to understand that the speed must be subject to measure. You cannot infer a passing speed of 200 km/hr from some external point overlooking the passing point. From any external frame, each car is moving at 100 km/hr. Only from a frame of reference inside one of the moving cars can you arrive at a relative speed of 200 km/hr.
Wiki User
∙ 15y ago
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The speedometer of a car moving east reads 55mph it passes another car going west at 55mph the cars have the same?
Speed - but NOT velocity.
The speedometer of a car moving to the east reads 100km per hr and it passes another car that moves to the west at 100km per hr so do both cars have the same velocity please explain?
Velocity is direction and speed so the vehicle do not have the same velocity
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