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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)
Options
(a) 30 J
(b) 40 J
(c) 10 J
(d) 20 J
Correct Answer:
20 J
Explanation:
When the body is thrown upwards. its K.E is converted into P.E. The loss of energy due to air friction is the difference of K.E and P.E
1/2 mv² – mgh = 1/2 x 1 x 400 – 1 x 18 x 10
= 200 – 180 = 20 J
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Topics: Work Energy and Power
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The horizontal range and maximum height attained by a projectile are R and H,respectively
- In an a.c circuit the e.m.f. (e) and the current (i) at any instant are given
- An α-particle of energy 5 MeV is scattered through 180⁰ by a fixed uranium nucleus.
- If the band gap between valence band and conduction band in a material is 5.0 eV,
- A small rod of bismuth is suspended freely between the poles of a strong electromagnet.
Topics: Work Energy and Power (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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