If the velocity of a body increases by three
times the ate for previous change in kinetic energy
a) 1500% b) 800% c) 15%

1 thought on “If the velocity of a body increases by three<br />times the ate for previous change in kinetic energy<br />a) 1500% b) 800% c) 15%”

1. AnsWer :–

   • Initial velocity = v
   • Final velocity = v + 3v = 4v
   • Mass = m

   Kinetic Energy :–

   • It’s always non negative.
   • It’s a scalar quantity.
   • It depends on frame of reference.
   • It doesn’t depend on direction of velocity.

   Formula for calculating the Kinetic energy :–

   • K.E = ½mv²

   According to the Question :–

   => ∆K.E % = [(K.Ef – K.Eᵢ)/K.Eᵢ] × 100

   => ∆K.E % = [(½m(4v)² – ½m(v)²)/½m(v)²] × 100

   => ∆K.E % = [(16v² – v²)/v²] × 100

   => ∆K.E % = (15v²/v²) × 100

   => ∆K.E % = 15 × 100

   => ∆K.E % = 1500 %

   • Hence,the option A) 1500% is the correct answer.

   Log in to Reply