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Let I be the purchase value of an equipment and V( t) be the value after it has been used for t years. The value V( t) depreciates at a rate given by…

JEE Main 2011 — Mathematics Calculus

2011mcqmedium

Let I be the purchase value of an equipment and V(t)\mathrm{V}(\mathrm{t})V(t) be the value after it has been used for t years. The value V(t)\mathrm{V}(\mathrm{t})V(t) depreciates at a rate given by differential equation dV(t)dt=−k(T−t)\frac{\mathrm{dV}(\mathrm{t})}{\mathrm{dt}}=-\mathrm{k}(\mathrm{T}-\mathrm{t})dtdV(t)​=−k(T−t), where k>0\mathrm{k}>0k>0 is a constant and T\mathrm{T}T is the total life in years of the equipment. Then the scrap value V(T)\mathrm{V}(\mathrm{T})V(T) of the equipment is

Official previous-year question

Held on 30 Apr 2011 · Verified 6 Jul 2026.

Options

  1. A

    I−kT2\mathrm{I}-\frac{\mathrm{kT}}{2}I−2kT​

  2. B

    1−k(T−t)221-\frac{k(T-t)^2}{2}1−2k(T−t)2​

  3. C

    e−kTe^{-k T}e−kT

  4. D

    T2−1k\mathrm{T}^2-\frac{1}{\mathrm{k}}T2−k1​

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