Question 24
A ball starts rolling from the centre of a $3\text{ m}\times4\text{ m}$ room in a direction of $45^\circ$ to the walls. It rolls in a straight line except when it bounces off a wall and it does that at an angle of $45^\circ$.
After it has travelled 20 m, how many times has it bounced off a wall?
After it has travelled 20 m, how many times has it bounced off a wall?