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.
Answer
A
There is a net force of 15 N against them and they cannot move the box.
B
There is a net force of 15 N allowing Levi and Clara to move the box.
C
There is a net force of 65 N against them and they cannot move the box.
D
There is a net force of 80 N allowing Levi and Clara to move the box.
Explanation
Levi and Clara apply a total force of 30 N + 50 N = 80 N. Friction acts against their effort with 65 N, so the net force is 80 N − 65 N = 15 N in their direction. That means the forces allow them to move the box, matching choice B.
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