## Related questions with answers

In the previous problem suppose your friend in the car measures the width of the car door to be $90 \mathrm{~cm}$. 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.

Solutions

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

The answer will depend on the car’s speed. If the car is too slow, it is too fast then, I might measure a smaller value compared to the proper measurement. It might be hard to measure the width of a moving object in my reference frame, but an estimate is mostly possible.

Hence, **problem statement (4)** is the answer.

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