27-01-2015
Physics

Answered

If the velocity of an object is doubled , it's kinetic energy is ?

A. Doubled

B.decreased

C. Quadrupled

D. Unaffected

Answer :

balfouri balfouri

27-01-2015

Ek = 1/2 × m × v² ;
Ek...kinetic energy
m...mass
v...velocity

If we double the velocity,then Ek = 1/2 × m × (2×v)² = 1/2 × m × 4×v² = 2×m×v²

[tex] \frac{2*m*v ^{2} }{ \frac{1}{2}*m*v^2 } = 4[/tex] so the correct answer is C

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