Use , where is the electron's velocity at any time , is its velocity at time , and is its acceleration. Let at the instant the electron's velocity is and evaluate the expression for (a) and for .
[(a) ; (b) ]
, where 
is the electron's velocity at any time 
, 
is its velocity at time 
, and 
is its acceleration. Let 
at the instant the electron's velocity is 
and evaluate the expression for (a) 
and for 
.
; (b) 
]