A. p = h/0.26 nm = 6.63x10^-34 / 2.6x10-10 = 2.55x10^-24 kg * m/s
B. Ek = p^2/(2m) = 2.55^2 *10^(-48) /(2*1.675x10^(-27))
=1.94 x10^(-21) J
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