Levi and clara are trying to move a very heavy box. levi is pushing the box with a force of 30 n, and clara is pulling the box with a force of 50 n. the box exerts a frictional force of 65 n. which best explains the forces? there is a net force of 15 n against them and they cannot move the box. there is a net force of 15 n allowing levi and clara to move the box. there is a net force of 65 n against them and they cannot move the box. there is a net force of 80 n allowing levi and clara to move the box.

A = force by which levi push the box = 30 N

B = force by which clara pulls the box = 50 N

f = frictional force acting on the box = 65 N

the pushing and pulling forces acts in same direction and the frictional force acts in opposite direction. hence the net force is given as

Net force = Sum of pushing and pulling force - frictional force

Net force = 30 + 50 - 65

Net force = 15 N

hence the correct choice is

There is a net force of 15 N allowing Levi and Clara to move the box.

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.