An electron moving with a velocity 50000 m/s enters into a uniform electric field and acquires a uniform acceleration of 10000m/s² in the direction of its initial motion. The time in which the electron would acquire a velocity double of its initial velocity.

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Velocity is the speed of an object in a certain direction so you'd need to know speed and direction

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j