How will the electrostatic force be changed if the distance between electric charges is reduced one half of the original distance? A) more than original force
B) less than original force
C) impossible to determine
D) the same as original force

The consumption of fossil fuels could be

Suppose you increase your walking speed from 7 m/s to 13 m/s in a period of 2 s. what is your acceleration?

The man of mass m1 and the woman of mass m2 are standing on opposite ends of the platform of mass m0 which moves with negligible friction and is initially at rest with s = 0. the man and woman begin to approach each other. derive an expression for the displacement s of the platform when the two meet in terms of the displacement x1 of the man relative to the platform.