alleryKinetic energy of a body of mass m moving with speed v is:
AK = m v
BK = ½ m v
CK = m v²
DK = ½ m v²
Answer & Solution
Correct answer: D. K = ½ m v²
1. From W = ΔKE and F dx = m v dv, integrating from 0 to v gives K = ½ m v².
2. KE is scalar and always non-negative.
3. The dimension is [M L² T⁻²], same as energy.
_Source: syllabus Physics Ch 5, §5.4 Kinetic Energy, p. 79_
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