A 4-kg mass and a 5-kg mass are in contact with each other while resting on a smooth table. A 20-N external force is applied to the 5-kg mass (in a direction toward the 4-kg mass). The acceleration of the 4-kg mass is
A) 1.8 m/s $2$
B) 3.1 m/s $2$
C) 2.2 m/s $2$
D) 3.8 m/s $2$

Question

Quizplus · Accepted Answer

The total force applied is 20 N, and the total mass is 4 kg + 5 kg = 9 kg. The acceleration, a, can be found using Newton's second law, $F = ma$, giving $a = \frac{F}{m} = \frac{20}{9}$ m/s$^2$ ≈ 2.2 m/s$^2$.

A 4-Kg Mass and a 5-Kg Mass Are in Contact 222

A 4-Kg Mass and a 5-Kg Mass Are in Contact $2$