AIPMT PRELIMS2009Physics-Work, Energy and Power
AIPMT PRELIMS 2009 Physics Conservation of Energy MCQ Question
Type: MCQ-numerical-Medium-Class 11
A body of mass 1 kg is thrown upwards with a velocity 20 m/s. It momentarily comes to rest after attaining a height of 18 m. How much energy is lost due to air friction? (g = 10 m/s²)
A
30 J
B
40 J
C
10 J
D
20 J
Correct Answer
Option D
Detailed Explanation
The initial kinetic energy is 1/2 mv² = 1/2 × 1 × 400 = 200 J. The potential energy at the highest point is mgh = 1 × 18 × 10 = 180 J. The energy lost due to air friction is the difference: 200 J - 180 J = 20 J.
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