Question

A body of mass 10 kg is kept on a rough horizontal surface. If the force applied on the body is increased by 80 N, then the acceleration of the body increases by:

• A. \( 16 \, \text{ms}^{-2} \)
• B. \( 12 \, \text{ms}^{-2} \)
• C. \( 8 \, \text{ms}^{-2} \)
• D. \( 10 \, \text{ms}^{-2} \)

Hint:

Force is directly proportional to acceleration, and the relationship is given by \( F = ma \).

Answer 1

The Correct Option is C

Step 1: Use change form of Newton’s second law

Instead of using F = ma directly, we use:

\Delta a = \frac{\Delta F}{m}

Step 2: Substitute values

\Delta a = \frac{80}{10}

\Delta a = 8 \, \text{m/s}^2

Final Answer: 8 \, \text{m/s}^2