Q31 / 92 · NTA Abhyas (JEE Main) 2020 · Physics · Work Power Energy

A body, starting from rest, is moved along a straight line by a machine delivering constant power. The distance moved by the body in time t is proportional to

  • A
    t1/2
  • B
    t3/4
  • Correct answer
    C
    t3/2
  • D
    t1/4

Solution

Power, P=Fv=constant

Or maat=constant 

Or a2t=constant

⇒a∝1t ....... (1)

Now, S=2  at2 ∵ u=0

⇒S∝at2

∴S∝t2t  [Using (1)]

⇒S∝t3/2

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

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