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A proton is projected in the positive x direction into a region of uniform electric field E = (-6.60e5) i hat N/C at t = 0. The proton travels 6.70 cm as it comes to rest.

(a) Determine the acceleration of the proton. magnitude _______m/s2 and direction (+-x,+-y,+-z)

(b) Determine the initial speed of the proton. magnitude _______m/s and direction (+-x,+-y,+-z)

(c) Determine the time interval over which the proton comes to rest. _____s
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a =qE/m   = 1.6x 10-19 x 6.60 x 10^5 (-i) / 1.673 x 10-27 = 6.31 x 10^13 m/s2 (-i)

direction along -ve x-axis

b) v^2 - u^2 =2as

0 - u^2 = 2 x 0.067 x 6.31 x 10^13

u = 2.91 x 10^ 6 m/s

along +ve x-axis\

c) v = u + at

0 = 2.91 x 10^ 6 + 6.31 x 10^13 .t

t = 4.61 x 10-8 sec
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