Question

A prankster drops a water balloon from the top of a building on an unsuspecting person….

A prankster drops a water balloon from the top of a building on an unsuspecting person on the sidewalk below. If the balloon is traveling at 30.3 m/s when it strikes aperson's head (1.5m above the ground), how tall is the building? Neglect air resistance.

I'm not sure as to how to approach this problem,
help would be appreciated, thanks!

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