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I found this question on the internet, I had been doing projectile questions all night with great success, however for some reason i cant seem to get 101km/hr for this question. It doesn't make sense.

If it is driven off the cliff, then inital vertical velocity is 0, therefore gravity will pull it down in 5.1 seconds no? So in that 5.1 seconds the car must have enough vertical velocity to go 90m, traveling at 17.6m/s for 5.1seconds will take you 90m.

Whats the deal? Is that answer wrong?