Question

He asked to find the heavier pen, given two pens and we should not use any weighing machine.

Answer 1

1. Drop the pens from the same height
2. Notice which pen falls on the ground first
3. The pen that falls on the ground first has a greater mass.
4 .You may use energy conservation to understand the concept better, as the pen with greater mass will have greater potential energy and inturn will have greater velocity and will hit the ground first