An airplane flying with a horizontal initial velocity of 80 m/s drops a package down to the ground. The plane is initially 490 meters above the ground. a) How long does it take the package to hit the ground?
b) What is the final vertical velocity of the package?
c) What is the horizontal displacement of the package?

Auniform electric field exists in the region between two oppositely charged plane parallel plates separated by a distance of 1.60 cm . a proton is released from rest at the surface of the positively charged plate and strikes the surface of the opposite plate in a time interval of 3.20×10-6 s. 1-find the magnitude of the electric field. use 1.60×10-19c for the magnitude of the charge on an electron and 1.67×10-27kg for the mass of a proton 2-find the speed of the proton when it strikes the negatively charged plate