vacuum container

Diagram shows a coin and a feather experiencing
free fall in a vacuum container.

Rajah menunjukkan sekeping duit syiling dan 
sehelai bulu ayam yang sedang jatuh bebas di dalam 
bekas vakum.





Which physical quantity is constant?
Kuantiti fizik yang manakah tetap?

A Velocity
B Acceleration
C Momentum
D Kinetic energy

Answer

B