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(a):
f=ke
energy = work done = average force * distance = 1/2 (F) * e
=1/2 fe
but f=ke so
=1/2 ke²
(b) each small block represent energy = 2N * 2 x 10^-5 m = 4 x 10^-5 J
count small boxex(put a dot in the one you have counted) and then multiply them by 4 x 10^-5