(a) SInce electric field is directed towards the ground and on moving towards the ground the charge losses its potential energy i.e it gains kinetic energy.It means electrostatic force on charge is also towards the ground i.e in the same direction of field so we can say that charge is positive.
now,
Work done by field on the charge=increase in K.E.=Decrease in P.E.
=>
=>
where d= distance covered by charge=439m
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(b) Work done by field=change in potential energy
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(C)Finally charged particle falls on earth and becomes neutralized so finally its potential becomes zero because potential of earth is also zero.
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