Question

If the action and reaction forces are always equal in magnitude, then these forces

• A. will produce accelerations of equal magnitudes.
• B. may not produce accelerations of equal magnitudes.
• C. produce velocities of equal magnitudes.
• D. will not produce accelerations of equal magnitudes

Answer 1

Answer: (B)

may not produce accelerations of equal magnitudes.

According to newton's 3rd law of motion, Every action has equal and opposite reaction. Action and reaction always act in pairs, and on different bodies.

Let two masses $m_1$ and $m_2$ are pairs of masses applying force on each other ie $F$.

Acceleration of masses will be $a_1=\frac{F}{m_1}$ and $a_2=\frac{F}{m_2}$ Hence acceleration of masses also depends on the mass.

So, these forces may not produce accelerations of equal magnitudes.