allery54 কিলোমিটাৰ প্ৰতি ঘণ্টাত 120 মিটাৰ ৰেলগাড়ীয়ে 60 ছেকেণ্ডত একে দিশেৰে যোৱা 180 মিটাৰ ৰেলগাড়ীক অতিক্ৰম কৰে। ৰে’লৰ গতি লেহেমীয়া?
A36 km/h
B30 km/h
C40 km/h
D45 km/h
Answer & Solution
Correct answer: A. 36 km/h
আপেক্ষিক গতি হ’ল (120 + 180)/60 = 5 m/s;
লেহেমীয়া ৰেলখন 15 − 5 = 10 m/s = 36 কিলোমিটাৰ/h ত চলে।
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