Aball is thrown horizontally from the top of a 64.5-m building and lands 103.8 m from the base of the building. ignore air resistance. (assume the ball is thrown in the +x direction and upward to be in the +y direction.) how long (in s) is the ball in the air?

The ball is in the air for 3.628 sec

Explanation:

We can find speed in the "y" direction when the ball lands with this equation:

Where:     because the ball is thrown horizontally

                because gravity is a vector that points down in the "y" direction

                because the ball lands on the ground

Then:      

                because the ball is falling and that means speed in the "y" direction is a vector that points down

Now we can calculate the time with next equation:

Then:      

Finally      t = 3.628 sec

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.