Q39 / 57 · KVPY 2019 (SA) · Physics

A steel ball is dropped in a viscous liquid. The distance of the steel ball from the top of the liquid is shown below. The terminal velocity of the ball is closest to

 

Figure

  • A
    0.26 m/s
  • Correct answer
    B
    0.33 m/s
  • C
    0.45 m/s
  • D
    0.21 m/s

Solution

Velocity = Slope of distance
- Time graph Last portion of given graph is a straight line which indicates that velocity is constant, i.e. terminal velocity is reached.

Figure

 

From data of graph, Terminal velocity,
v=x2-x1t2-t1=0.4-0.31.9-1.6

=0.10.3=0.33 m/s

Hence, the correct answer is option: 'B'.

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