allery150 m দীঘল এখন ৰে'লে 10 seconds-ত এটা বৈদ্যুতিক খুঁটি পাৰ হয়। ৰে'লখনৰ দ্ৰুতি নিৰ্ণয় কৰক:
A10 m/s
B12 m/s
C20 m/s
D15 m/s
Answer & Solution
Correct answer: D. 15 m/s
দ্ৰুতি = দৈৰ্ঘ্য / সময় = 150 m / 10 s = 15 m/s।
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