On planet Tehar, the acceleration of gravity is the same as that onEarth but the

Question

On planet Tehar, the acceleration of gravity is the same as that onEarth but there is also a strong downward electric field with thefield being uniform close to the planet's surface.A 2.03 kg ball having a chargeof 4.98 µC is thrownupward at a speed of 20.1 m/s and it hits the ground after aninterval of 4.10 s. What is the potential difference between thestarting point and the top point of the trajectory?
Will give full 10 Karma points for an answer!!!
Will give full 10 Karma points for an answer!!!

Explanation / Answer

y = ayt2/2 + v0yt
vf2 = vi2 +ayd
vf = vi + ayt
d = (vi + vf)/2
F = ma = -mg - qE

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