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Work, Energy and Power

JEE Main 2025 (Online) 22nd January Evening ShiftMCQEasy📈 Topic in 13% papers+4−1
Ques. 1JEE Main 2025, 22 January (Evening Shift)

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

  1. 20 J
  2. 5 J
  3. 15 J
  4. zero

Answer

(3) 15 J

Solution

[figure]

At the highest point only u 60 =10 m/s remains

Ki= 12(0.1)(20)2=20 J, Kf= 12(0.1)(10)2=5 J

K=20-5=15 J

Answer: (3)

Keep practising — Work, Energy and Power

Ques. 2JEE Main 2025, 22 January (Evening Shift)

A force F=2 i+b j+ k is applied on a particle and it undergoes a displacement i-2 j- k. What will be the value of b, if work done on the particle is zero.

  1. 13
  2. 12
  3. 0
  4. 2

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