PHYSICS: pls help me with this?

A car falls off a ledge and reaches the ground in 0.5 seconds, take g = 10m/s^2
1. What is its speed on striking the ground?
2. What is its average speed during 0.5 sec?
3. How high is the ledge from the ground?

Whoever answers first i will choose that answer as best answer. pls answer ASAP.
5 answers 5