im stuck on this one:(adsbygoogle = window.adsbygoogle || []).push({});

a person standing on an overpass above a roadway wishes to drop something onto a truck. the truck starts from rest and accelerates at half the speed of gravity from a position 100 m from the point of impact. the overpass is 30 m above the truck. how long after the truck started should the person wait before dropping the packgage? (gee = 10 m/s^2)

okay so basicallly wat ive got is this: the truck will take 20 seconds until it is perfectly lined up with the overpass;that being the point of impact. i also got that it will take 2.5 seconds for the package to travel 30 m accelerating at gee.

the answer is approx 3.9 secs but i dont know how to come to this, have i done something wrong?

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Uniform accelerated motion problem help

**Physics Forums | Science Articles, Homework Help, Discussion**