2: Relevant equations:
1)F=m*a
2)a = dv/dt
3)v = dx/dt
g=9.81m/s^2
3:
you need two equations(x,y) for your system that considers: distances(x,y), gravity and intial speed(x,y)
gravity only acts in Y
nothing acts in X (assuming drag is neglected)
KE_1 = 0
At your intial state, no kinetic energy is present, the object only has potential because it is at rest at a certain height(h not 0) from your reference ground which has h=0
initial: potential = all energy, kinetic = no energy (assumed at rest at point1)
final: potential = 0, kinetic...