18. How much force would it take to push another, larger friend who has a mass of 70 Kg to accelerate at the same rate of 4 m per sec every sec

280N

Explanation:

f = mass x acceleration

the answer is neither ball has a charge.

because if they were both positively charged, they will repel each other.

if they were positively and negatively charged, they will seek.

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