Physics
posted by Eva on .
A small ball rolls horizontally off the edge of a table that is 1.20 m high. It strikes the floor at a point 1.52 m horizontally from the table edge. How long is the ball in the air? What is the velocity of the ball when it hits the floor?

It fell 1.20m.
1.20= 1/2 g time^2 solve for time in air.
Velocity? Its intial horizontal veloicty must have been 1.52/timeinair.
So, take the falling final velocity (v= g t), add it to the horizontal velocity as a vector at 90 degrees, and you have the velocity at the floor. 
What is g? The acceleration in m/s^2?

g= 9.8m/s^2

How do you get rid of t^2

Square root.

a ball rolls off an 80cm high table & lands 1.2m a long the floor (g=10m/s.s) find total time?