RRB Technician Grade 3 previous year question
The kinetic energy of an object of mass m moving with a velocity of 5 m/s is 25 J. If its velocity is doubled to 10 m/s, what will be its kinetic energy?
Asked in RRB Technician Grade 3 (06 Mar 2026 Shift 3) · Science
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Correct answer: (B) 100 J
Kinetic energy is proportional to the square of velocity (KE = ½mv²). Doubling velocity from 5 to 10 m/s increases KE by a factor of 4, so new KE = 25×4 = 100 J.
हिंदी में प्रश्न
5 m/s के वेग से गतिमान m द्रव्यमान की एक वस्तु की गतिज ऊर्जा 25 J है। यदि इसका वेग दोगुना करके 10 m/s कर दिया जाए, तो इसकी गतिज ऊर्जा कितनी होगी?
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सही उत्तर: (B) 100 J
गतिज ऊर्जा वेग के वर्ग के समानुपाती होती है (KE = ½mv²)। वेग को 5 से 10 मी/से करने पर KE 4 गुना बढ़ जाती है, अतः नई KE = 25×4 = 100 J.
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