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MHT CET202012 Oct 2020Evening ShiftMathematicsApplication of DerivativesActual

The displacement of a particle at time 't' is s=t³-4 t²-5 t , then the velocity of the particle at t=2 sec . is

Options

  1. A( 1 9 ) units / sec .
  2. B-9 units / sec
  3. C9 units / sec .
  4. D( -1 9 ) units / sec.

Correct answer

B. -9 units / sec

Step-by-step solution

Given s=t³-4 t²-5 t d s d t =3 t²-8 t-5 At t=2, v= d s d t =3(4)-8(2)-5=12-16-5=-9

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