If density of earth is doubled keeping its radius constamt r accel due to gravity is
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F=dvg, d=m/v
m=2dv
f=2dva
F/f=dvg/2dva
F/f=1/2a
a=f/2F
m=2dv
f=2dva
F/f=dvg/2dva
F/f=1/2a
a=f/2F
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