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একটি গাড়ি যদি অতিক্রান্ত দূরত্বের অর্ধেক সমদ্রুতি v1 এবং অপর অংশ সমদ্রুতি v2, নিয়ে যায়, তাহলে গাড়িটির গড় দ্রুতি হবে-
[A] (v1+v2)/2
[B] (v1+v2)/v1v2
[C] v1v2/(v1+v2)
[D] 2v1v2/(v1+v2)
সঠিক উত্তর : 2v1v2/(v1+v2)
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