Added Luis's English solution of 7.1.3

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+ <h2>Solutions of Savchenko Physics Textbook</h2>
+ <p class="author">
+ Aliaksandr Melnichenka <br/>
+ October 2023
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+
+ <h3 id="back-link"><a href="../">$\leftarrow$Back</a></h3>
+
+ <h3> Statement </h3>
+
+ <p>
+ $7.1.3$
+ A particle with a charge $q$ and a mass $m$ passes through a region of a uniform electric field of length $d$ in time $t$. The velocity $v$ of a particle entering the field is directed along the field. Determine the electric field intensity.
+ </p>
+
+ <h3>Solution</h3>
+ <p>
+ The motion of particle is accelerated by electric field, so
+ $$d = vt-\frac{at^2}{2} \;(1)$$
+ Applying Newton Second Law
+ $$F = qE = ma$$
+ then,
+ $$a = \frac{qE}{m} \;(2)$$
+ Putting $(2)$ into $(1)$
+ $$\boxed{E = 2m\frac{d-vt}{qt^2}}$$
+ </p>
+ <p style="text-align: right; font-style: italic; font-size: 14;">
+ BSc. Luis Daniel Fernández Quintana<br>
+ Physics Department (FCNE)<br>
+ Universidad de Oriente, Cuba<br>
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