The net force acting on the box is 18 N. What is the force of friction?
0-22 N
04N
O4N
F = 22 N
0 22 N
F = ?N

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

Under the action of a constant force an object accelerates at 7.8 m/s2. what will the acceleration be if (a) the force is halved? (b) the object's mass is halved? (c) the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?

If a hiker that weighs 600 newtons climbs a 50 meter hill, how much gravitational potential energy has the hiker gained?