Physics-
General
Easy

Question

A particle of a mass 0.1 blank k g is subjected to a force which varies with distance as shown in fig. If it starts its journey from rest at x equals 0, its velocity at x equals 12 blank m is

  1. 0 blank m divided by s    
  2. 20 square root of 2 blank m divided by s    
  3. 20 square root of 3 blank m divided by s    
  4. 40 blank m divided by s    

The correct answer is: 40 blank m divided by s


    Area between curve and displacement axis
    equals fraction numerator 1 over denominator 2 end fraction cross times open parentheses 12 plus 4 close parentheses cross times 10 equals 80 blank J
    In this time body acquire kinetic energy equals fraction numerator 1 over denominator 2 end fraction blank m v to the power of 2 end exponent
    By the law of conservation of energy
    fraction numerator 1 over denominator 2 end fraction m v to the power of 2 end exponent equals 80 blank J
    rightwards double arrow fraction numerator 1 over denominator 2 end fraction blank cross times 0.1 cross times v to the power of 2 end exponent equals 80 rightwards double arrow v to the power of 2 end exponent equals 1600 rightwards double arrow v equals 40 blank m divided by s

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