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# What is the speed of electron after 3 nanosecond?

A charge of mass 0.49 microgram is accelerated from rest in a uniform electric field at 3 nano second. A force of 4 N is exerted on the charge by the field. Neglect the gravitational force, what is the speed of electron after 3 nanosecond?

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- NCSLv 73 months agoFavorite Answer
a = F / m = 4N / 0.49e-9kg = 8.19e9 m/s²

v = a*t = 8.19e9m/s² * 3e-9s = 24 m/s

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