alleryএকেখন 180 m দৈৰ্ঘ্যৰ ৰে'লে 54 km/h গতিত ইয়াৰ দিশে 18 km/h গতিত দৌৰি আহি থকা এজন দৌৰবিদক লগ পায়। তেওঁক পাৰ হ'বলৈ কিমান সময় লাগিব?
A12 seconds
B10 seconds
C8 seconds
D9 seconds
Answer & Solution
Correct answer: D. 9 seconds
আপেক্ষিক দ্ৰুতি 72 km/h = 20 m/s, গতিকে 180 / 20 = 9 seconds।
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