Physics-
General
Easy

Question

A body of mass 2 kg slides down a curved track which is quadrant of a circle of radius 1 metre. All the surfaces are frictionless. If the body starts from rest, its speed at the bottom of the track is

  1. 4.43 m/sec    
  2. 2 m/sec    
  3. 0.5 m/sec    
  4. 19.6 m/sec    

The correct answer is: 4.43 m/sec


    By conservation of energy, m g h equals fraction numerator 1 over denominator 2 end fraction m v to the power of 2 end exponent
    Þ v equals square root of 2 g h end root equals square root of 2 cross times 9.8 cross times 1 end root equals square root of 19.6 end root equals 4.43   m rightwards arrow over short leftwards arrow divided by rightwards arrow over short leftwards arrow s

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