Two point charges of 30 nC and – 40 nC are held fixed on an x-axis at the origin and at x = 72 cm, respectively. A particle with a charge of 10 μC is released from rest at
x = 30 cm. If the initial acceleration of the particle has a magnitude of 12.5 × 103 m/s
2
,

find the mass of the particle.

An electron moves with a constant horizontal velocity of 3.0 × 106 m/s and no initial vertical velocity as it enters a deflector inside a tv tube. the electron strikes the screen after traveling 26 cm horizontally and 19 cm vertically upward with no horizontal acceleration. what is the constant vertical acceleration provided by the deflector? (the effects of gravity can be ignored.)