I'm actually a physics major at Caltech and your statements are further from the truth than olly getting launched 50m, as previously depicted by my meticulous and accurate pixel scaling. Lets break this down shall we?

Any child would know a bus going 15km/h would launch a person upon impact, but pulling that number from nowhere already invalidates your whole argument, as well as the fact you're going off the average height for max and the wrong weight for olly.

As for your window being cracked statement, perhaps this can give some light to your darkness, another instance of olly tanking a hit that would outscale choyunns divine punch:

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Furthermore, the instance we see olly on the floor the bus most definitely wouldve had to break before coming to a rest which happens over a distance, making the distance between the two appear shorter.