If a body is accelerated by a force of 400n and is accelerated with 20ms what is its mass ? help

Explain how a step-down transformer makes electricity safe for use in homes

Describe the three ray tracing steps used to identify an image for the given situation.

An electron and a proton are held on an x axis, with the electron at x = + 1.000 m and the proton at x = - 1.000 m. part a how much work is required to bring an additional electron from infinity to the origin? express your answer with the appropriate units. part b if, instead of the second electron coming in from infinity, it is initially at x = + 20.00 m on the axis and is given an initial velocity of 100.0 m/s toward the origin, does it reach the origin? part c how close to the origin does it come?