The kinetic energy of an object of mass
The kinetic energy of an object of mass m moving with a velocity v is 25 J. What will be its kinetic energy when its velocity is increased three times (3v)?
वेग v से गतिमान m द्रव्यमान की किसी वस्तु की गतिज ऊर्जा 25 J है। जब इसका वेग बढ़ाकर तीन गुना (3v) कर दिया जाए तो इसकी गितज ऊजा कितनी होगी?
Detailed Solution & Logic
225 J
📘 Explanation
Given, initial kinetic energy
$KE = \dfrac{1}{2}mv^2 $
Initial kinetic energy (प्रारम्भिक गतिज ऊर्जा) =25 J
Initial velocity (वेग) =v
When velocity becomes (अब नया वेग) - $3v$,
New kinetic energy - (नई गतिज ऊर्जा):
$KE' = \dfrac{1}{2}m(3v)^2$
$KE' = \dfrac{1}{2}m \times 9v^2$
$KE' = 9 \left(\dfrac{1}{2}mv^2\right)$
Since,
$\dfrac{1}{2}mv^2 = 25,J$
Therefore,
$KE' = 9 \times 25$
$KE' = 225,J$
Kinetic energy becomes 9 times when velocity becomes 3 times.
वेग तीन गुना होने पर गतिज ऊर्जा 9 गुना हो जाती है।
⭐ Extra Facts / अतिरिक्त तथ्य
🔹 English
Kinetic energy depends on the square of velocity.
Doubling velocity makes KE 4 times; tripling makes it 9 times.
🔹 Hindi
गतिज ऊर्जा वेग के वर्ग (square) पर निर्भर करती है।
वेग दोगुना ⇒ ऊर्जा 4 गुना, वेग तीन गुना ⇒ ऊर्जा 9 गुना।
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