Question

Question 22(ii)
An electron moving with a velocity of $5\times {10}^{4}m{s}^{-1}$ enters into a uniform electric field and acquires a uniform acceleration of ${10}^{4}m{s}^{-2}$ n the direction of its initial motion.

(ii) How much distance the electron would cover in this time?

Answer 1

Given initial velocity, $u=5\times {10}^{4}m{s}^{-1}$ and acceleration, $a={10}^{4}m{s}^{-2}$
(ii) Using $s=ut+\frac{1}{2}a{t}^2$
$=(5\times {10}^4)\times 5+\frac{1}{2}\left({10}^4\right)\times (5{)}^2=25\times {10}^4+\frac{25}{2}\times {10}^4=37.5\times {10}^{4}m$