- Two students observe a book of mass 0.2 kg fall vertically from rest from a shelf that is 1.5 m above the floor.
Student \(A\) suggests that the book is modelled as a particle falling freely under gravity.
- Use student \(A\) 's model to find the time taken for the book to reach the floor.
Student \(B\) suggests an improved model where the book is modelled as a particle experiencing a constant resistance to motion of magnitude \(R\) newtons.
Given that the time taken for the book to reach the floor is 0.6 seconds,
- use student \(B\) 's model to find the value of \(R\)