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e = .7;
g = 5000;
nMax = 9;

n = 0;
if (numKeys > 0) {
  n = nearestKey(time).index;
  if (key(n).time > time) n--;
}
if (n > 0) {
  t = time - key(n).time;
  v = -velocityAtTime(key(n).time - .001)*e;
  vl = length(v);
  if (value instanceof Array) {
    vu = (vl > 0) ? normalize(v) : [0,0,0];
  } else {
    vu = (v < 0) ? -1 : 1;
  }
  tCur = 0;
  segDur = 2*vl/g;
  tNext = segDur;
  nb = 1; // number of bounces
  while (tNext < t && nb <= nMax) {
    vl *= e;
    segDur *= e;
    tCur = tNext;
    tNext += segDur;
    nb++
  }
  if(nb <= nMax) {
    delta = t - tCur;
    value +  vu*delta*(vl - g*delta/2);
  } else {
    value
  }
} else {
  value
}

n = 0;
if (numKeys > 0) {
  n = nearestKey(time).index;
  if (key(n).time > time) {
    n--;
  }
}
if (n == 0) {
  t = 0;
} else {
  t = time - key(n).time;
}

if (n > 0 && t < 1) {
  v = velocityAtTime(key(n).time - thisComp.frameDuration/10);
  amp = .05;
  freq = 4.0;
  decay = 8.0;
  value + v*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t);
} else {
  value;
}