The mean velocities at two ends of a stream tube 10 cm apart are 2.5 m/s and 3 m/s. The convectional tangential acceleration mid-way is

- 1
  
  zero
- 2
  
  $0.5 m / s^{2}$
- 3
  
  $13.75 m / s^{2}$
- 4
  
  non determinable

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