A body of mass 2 kg has momentum 10 kg m/s. Its kinetic energy is
A. 50 J
B. 20 J
C. 5 J
D. 25 J
Answer: Option D
Solution (By JKSSB Mock Tests)
Kinetic energy K = p²/(2m) = (10)²/(2×2) = 100/4 = 25 J. Also, velocity v = p/m = 5 m/s, K = ½×2×5² = 25 J. Formula p²/(2m) is useful for quick computation. Always ensure units: kg, m/s, J.
Explanation:
Ohm's law V=IR is linear relationship, valid for ohmic materials like metals at constant temperature. Non-ohmic do not follow linear I-V. Semiconductors are non-ohmic.
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