Question

A particle of mass m and charge q is released from rest in a uniform electric field. If there is no other force on the particle, the dependence of its speed v on the distance x traveled by it is correctly given by (graphs are schematic and not drawn to scale)

Answer 1

Answer is 

v² = u² + 2as 

v² = 0 + 2(qE/m)x

v² = (2qE/m)x

Answer 2

Answer is (3)

V² = (2qE/m)x