Projectile Motion Homework Problem: Finding Time for a Ball Dropped from 4m

[AnomalyCoder]

Homework Statement

You drop a ball (0.5kg) from a height of 4m.
How long did the ball take to hit the ground?

Acceleration = -10 due to gravity.

Homework Equations

$$\Delta$$x = Area Under a Velocity-Time graph.
^ In this case, it will be .5*Velocity*Time.

The Attempt at a Solution

Acceleration = -10 due to gravity.
After that, I have no idea. I mean, how does one figure out what anything is?
All that is given is the ball weight and the height. How do you find the velocity without the time?

I just need some guidance, anyone know of a good resource that explains this topic?
Once I find the Velocity, finding time would be no problem whatsoever.

 

[Fewmet]

When a physics problem says "drop", it is understood that it means the initial velocity is zero.

You can look on this as a code, but it should also make sense that "throw" would be the word used if V_i$$\neq$$0.

 

[Zryn]

Are you familiar with the basic 4 equations of motion? There's heaps of info all over the web, or even just check out http://en.wikipedia.org/wiki/Equations_of_motion" .

There is one that concerns itself with distance (height), acceleration and time.

Sometimes the questions will give you redundant data to confuse you. Look at the 4 equations and see which ones use an objects mass (measured in kg).

All that is given is the ball weight and the height. How do you find the velocity without the time?

Keep in mind that the statement asks for time, not velocity.