A 2 kg body falls 10 m from rest against a constant air resistance of 4.6 N. Its speed on reaching the ground is (g = 9.8):

  1. 12.2 m/s
  2. 6.12 m/s
  3. 24.5 m/s
  4. 14 m/s
Answer

A) 12.2 m/s

mgh - fh = 12mv^2 Rightarrow 196 - 46 = 150 J; v = 12.2 m/s. SLO P-11-B-32 · Application

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