A plane flying horizontally at 390 m/s releases a package at an altitude of 15,514 m. How long will the package take to reach the ground?

Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost

Two cannon balls weighing 18 kg and 24 kg are chained together and fired horizontally with a velocity of 165 m/s from the top of a 21-m wall. the chain breaks during the flight of the cannonballs and the 18-kg cannonball strikes the ground at t = 1.5 s, at a distance of 240 m from the foot of the wall, and 7 m to the right of the line of fire. determine the position of the other cannonball at that instant. neglect the resistance of the air.

What ions are formed when hcl dissolves in water?