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JEE Main202522 Jan 2025Evening ShiftPhysicsMotion in Two DimensionsActual

A ball of mass 100 g is projected with velocity 20 ~m / s at 60^ with horizontal. The decrease in kinetic energy of the ball during the motion from point of projection to highest point is

Options

  1. A5 J
  2. B15 J
  3. C20 J
  4. Dzero

Correct answer

B. 15 J

Step-by-step solution

aligned & k _ i = 1 2 mv ^2 & k _ f = 1 2 ~m ( v 60^ )^2= 1 8 m v^2 & k = k _ i - k _ f = 3 8 mv ^2= 3 8 0.1 400=15 ~J aligned

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