A A boy can throw a ball with a net force of 55N.
How much greater will the acceleration be
when he throws a lkg softball as compared
to when he throws a
7 kg bowling ball?

f=ma a/f/m a= 480/60 a = 8m/s/s that is quick wow

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.