| Boy | Force (N) |
| Hunter | 25 |
| Jackson | 25 |
| Samuel | 30 |
| Sean | 35 |
A) 100 N toward the left
B) 115N toward the left
C) 100 N toward the right
D) 115 N toward the right
Correct Answer: A
Solution :
The total force applied by the four boys is the sum total of the respective forces applied by them, i.e.,\[25\text{ }N+25\text{ }N+30\text{ }N+35\text{ }N=115\text{ }N\]toward the left. Frictional force opposes the motion of a moving object. As a result, the frictional force experienced by the box is 15 N toward the right. Hence, the total force experienced by box is the difference between the total force applied by the boys and the frictional force, i.e.,\[115\text{ }N15\text{ }N=100\text{ }N\] toward the left. The correct answer is A.
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