Class 11th Overview Physics Physics Laws of Motion

The kinetic energy of a body varies directly as square of time elapsed. The force acting varies directly as

Option 1 - <p>t</p>

Option 2 - <p><span class="mathml" contenteditable="false"> <math> <mrow> <mroot> <mrow> <mi>t</mi> </mrow> <mrow></mrow> </mroot> </mrow> </math> </span></p>

Option 3 - <p><span class="mathml" contenteditable="false"> <math> <mrow> <mfrac> <mrow> <mn>1</mn> </mrow> <mrow> <mroot> <mrow> <mi>t</mi> </mrow> <mrow></mrow> </mroot> </mrow> </mfrac> </mrow> </math> </span></p>

Option 4 - <p><span class="mathml" contenteditable="false"> <math> <mrow> <msup> <mrow> <mi>t</mi> </mrow> <mrow> <mn>0</mn> </mrow> </msup> </mrow> </math> </span></p>

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Answered by

Vishal Baghel | Contributor-Level 10

4 months ago

Correct Option - 4

Detailed Solution:

$K . E . \propto t^{2}$

$\begin{array}{l} \Rightarrow \frac{1}{2} m v^{2} \propto t^{2} \\ \Rightarrow v \propto t \\ \Rightarrow \frac{d v}{d t} = c o n s t a n t \\ \Rightarrow F = m a = \frac{m d v}{d t} = c o n s t a n t \end{array}$

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Physics Laws of Motion 2025

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