A lubricating oil is driven through a pipe using an electric pump. The speed of an oil particle is plotted in the first 10 s of operation. Determine the acceleration of an oil particle through every stage shown on the graph.

• A. First stage a = 3.5 m/s² ;
  Second stage a = - 0.6 m/s² ;
  Third stage a = 0 m/s²
• B. First stage a = 3.5 m/s² ;
  Second stage a = 0.6 m/s² ;
  Third stage a = 4.0 m/s²
• C. First stage a = - 3.5 m/s² ;
  Second stage a = 0.6 m/s² ;
  Third stage a = - 4.0 m/s²
• D. First stage a = - 3.5 m/s² ;
  Second stage a = 0.6 m/s² ;
  Third stage a = 0 m/s²