A ball rolls toward a wall a total of 6 m in 1.2 minutes what is the ball's velocity?

think its the third option

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.