PLEASE HELP Proton in an electric field

A proton of mass 1.67 x 10-27 kg enters the region between two parallel plates a distance 38.0 cm apart. There is a
uniform electric field of 3.00 x 104 V/m between the plates. If the initial speed of the proton is 2.00 x 106m/s what is it's
final speed?

The long handle on a rake is a(n) a. lever b. screw c. wedge d. inclined plane

Awater balloon launcher uses an elastic band with a spring constant of 115 n/m to use thee launcher you stretch thee band back with a balloon n it the water balloons have a mass of 1.3 kg a) if you stretch the band by 0.8 m, what elastic force will the band exert? b) with the band stretched 0.8 m, how much elastic potential energy is stored in the spring? c) if you release the band, it pushes forward. what is the kinetic energy of the balloon when it reaches the natural length of the band? d) what is the speed of the balloon when it reaches the natural length of the band?

Which of these statements best explains how the hydrosphere interacts with the atmosphere to affect global climate? mountains block rain clouds and cause changes in global rainfall and evaporation. humans burn fossil fuels to produce greenhouse gases which cause global warming. humans cut down trees which affects the amount of oxygen in different parts of the globe. greenhouse gases, like carbon dioxide, dissolve in oceans and prevent global warming.