Question

A force acting on an object of mass 500 g changes its velocity from 200 cm/s to 0.2 m/s. The change in momentum

• A. increases by 0.90 kg m/s
• B. decreases by 90 kg m/s
• C. increases by 90 kg m/s
• D. decreases by 0.90 kg m/s

Hint:

Remember, momentum is the product of mass and velocity. A decrease in velocity leads to a decrease in momentum.

Answer 1

The Correct Option is D

Let’s break down the solution step by step: Step 1: We are given:
Mass of the object \( m = 500 \text{ g} = 0.5 \text{ kg} \)
Initial velocity \( u = 200 \text{ cm/s} = 2 \text{ m/s} \)
Final velocity \( v = 0.2 \text{ m/s} \)


Step 2:
The change in momentum \( \Delta p \) is calculated as: \[ \Delta p = m(v - u) = 0.5 \times (0.2 - 2) = 0.5 \times (-1.8) = -0.9 \, \text{kg m/s} \]

Step 3:
Thus, the momentum decreases by 0.90 kg m/s. Therefore, the correct answer is (4).