Question

If a stone of mass 0.05kg is thrown out of a window of a train moving at a constant speed of 100km/h, the magnitude of the net force acting on the stone is:

• A. \(0.5\,\text{N}\)
• B. zero
• C. \(50\,\text{N}\)
• D. 5N

Hint:

Constant velocity implies zero net force.

Answer 1

The Correct Option is B

Step 1: The train is moving with constant velocity.
Step 2: Hence acceleration of the stone (horizontally) is zero.
Step 3: Net force F = ma = 0.