A ball falls from height ℎ. After 1 second, another ball falls freely from a point 20 𝑚 below the point from where the first ball falls. Both of them reach the ground at the same time. What is the value of ℎ

Question : A ball falls from height ℎ. After 1 second, another ball falls freely from a point 20 𝑚 below the point from where the first ball falls. Both of them reach the ground at the same time. What is the value of ℎ