how many times father see kid's falling and bouncing ball

A child is playing with a ball on the nth floor of a tall building. The height of this floor, h, is known.

He drops the ball out of the window. The ball bounces (for example), to two-thirds of its height (a bounce of 0.66).

His father looks out of a window 1.5 meters from the ground.

How many times will the father see the ball pass in front of her window (including when it's falling and bouncing?

 

 

 

my solution

function bouncingBall(h,  bounce,  window) { 
  // your code here 
   
  if(bounce ===0||bounce < 0||bounce >1||bounce ===1 || window> h || window ===h || h===0 || h <0) return -1; 
   
  count = 1; 
   
  while(h>window) { 
    h=h*bounce; 
    if(h>window) count+=2; 
  } 
   
  return count; 
}

const bouncingBall=(h, b, w)=>(b>=1 || h<w || b<=0) ? -1 : Math.ceil(Math.log(w/h)/Math.log(b))*2-1;

https://people.richland.edu/james/lecture/m116/logs/properties.html

4.3 - Properties of Logarithms