Aluminium spheres P and Q, with masses $0.50\,\text{kg}$ and $1.0\,\text{kg}$ respectively, are let go together from the same height. Why do they experience the same acceleration?
- AThe density of P is equal to the density of Q.
- BThe force on P is equal to the force on Q.
- CThe force on Q is double the force on P.
- DThe gravitational field strength for Q is double that for P.