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p { margin-bottom: 0.25cm; direction: ltr; line-height: 120%; text-align: left; }p.western { } A body of mass ‘m’ is dropped from a height ‘h’ reaches the ground with a velocity . The work done by the air resistance is

p { margin-bottom: 0.25cm; direction: ltr; line-height: 120%; text-align: left; }p.western { }
  1. A body of mass ‘m’ is dropped from a height ‘h’ reaches the ground with a velocity . The work done by the air resistance is

Grade:11

1 Answers

Vikas TU
14149 Points
5 years ago
From WET that is Work Energy Theorem,
W = Change in K.E
Hence,
Wair res. + Wmgh = 0.5m(gh/2) – 0
Wair. res. = 0.5m(gh/2)  – mgh => mgh/4 – mgh => -3mgh/4 J 

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