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Question

A body of mass 0.4 kg falls through air with an acceleration of 5 ms2. The frictional force of air on the body is :
  1. 0.02 N
  2. 1 N
  3. 2 N
  4. 0.2 N

A
2 N
B
0.2 N
C
1 N
D
0.02 N
Solution
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In general if there is no friction acceleration for free falling is a = g = 10m/s2
now due to friction anet=5m/s2
Retardation due to friction =afriction105=5m/s2
Friction force f =mafriction=0.4×5=2N

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