phys - mechanics MC

👨🏻‍🏫 學術台其他 - 科學

Ellen

2009-09-16 5:01 am

請指教並解釋:
http://good-times.webshots.com/photo/2085310850103642988SlBdFF

更新1:

thank you for your reply, then is it the same thing for the magnitude of velocity of X relative to Y?

更新2:

thank you very much.

回答 (1)

Prof. Physics

2009-09-16 5:08 am

✔ 最佳答案

If the bodies are moving with uniform velocity, then the position does not affect their relative velocity.

The magnitude of velocity of Y relative to X can be found by Pythragus theorem,

│v│

= sqrt(32 + 42)

= 5 m/s

The answer is B.

2009-09-16 09:07:48 補充：
yep

參考: Physics king

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