math
posted by John .
An electron moving along the x axis has a position given by x = 14te^5t m, where t is in seconds. How far is the electron from the origin when it momentarily stops?

If the electron stops, it means that the velocity has gone to zero.
x = 14te^5t
dx/dt = 14e^5t (1  5t)
that is zero when t = 1/5
x(.2) = 1.03