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JEE Mains · Physics · STD 11 - 5. work,energy,power and collision

જો વેગમાન \(20\%\) વધારવામાં આવે તો ગતિઊર્જા \(........\%\) જેટલી વધે છે.

  1. A \(36\)
  2. B \(40\)
  3. C \(44\)
  4. D \(48\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(44\)

Step-by-step Solution

Detailed explanation

\(P ^{\prime}= P +\frac{20}{100} P =1.2 P\) \(\%\) change in \(KE =\frac{ K ^{\prime}- K }{ K } \times 100\) \(=\left(\frac{\frac{ P ^{2}}{2 m }-\frac{ P ^{2}}{2 m }}{\frac{ P ^{2}}{2 m }}\right) \times 100\) \(= {\left[(1.2)^{2}-1\right] \times 100 }\) \(= 44\%\)
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