In the previous problem suppose your friend in the car measures the width of the car door to be 90 cm90 \mathrm{~cm}. You also measure the width as he goes by you. How will your value for the door width compare to his? (1) Your value will be smaller. (2) Your value will be larger. (3) Your value will be the same. (4) You cannot compare the widths, as the answer depends on the car's speed.


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Our task is to compare the door widths of the car that my friend and I measured in different reference frames.

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