Consider the following scenario: In a railroad yard, a train is being assembled. An empty boxczi, coasting at 3 m/s, strikes a loaded car that is stationary, and the car couple together. Each of the boxcars has a mass of 9,000 kg when empty, and the loaded car contains 55,000 kg of lumber. Assuming momentum is conserved, what is the total momentum of the system before and after the collision?​

Aball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and passes the top of the window 0.20 s later. the window is 2.0 m high from top to bottom. what was the ball's initial velocity? the unit vector j^ is directed upward. how far is the bottom of the window from the launch position? how high does the ball rise above the launch position?

Aforce of 9.00 newtons acts at an angle of 19.0 to the horizontal. what is its component in the horizontal direction?

Can anybody me with this? ? (picture included.)