In a region of space there is an electric field that points in the y-direction w

Question

In a region of space there is an electric field that points in the y-direction with component Ey = 24000 N/C. A ball of mass 2.4 x 10-7 kg and charge -344 nC has an initial velocity along the x-direction with vx0 = 130 m/s.
What is the acceleration of the ball. You can neglect the force of gravity a=(q*E/m)
How much time elapses before the ball has moved 0.15 m in the x-direction? t=(x/t)
What are the components of velocity at this time? y_f= (1/2)a*t^2
What is the y-component of the position of the ball at this time? d = t/v_y
(a)What is the direction of the velocity, an angle measured from the x-axis? ????? pls help just with part a

Explanation / Answer

ay=qe/m

=tan-1(vy/vx)=tan-1(ay*t/vx)

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