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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 ) |
30 J 40 J 10 J 20 J |
20 J |
\(\frac{1}{2}mv^2 - mgh = \frac{1}{2} × 1 × 400 - 1 × 18 × 10 = 200 - 180 = 20 J \) |
