A0.50 kg apple is 2.0 m above the reference level what is the gpe of the apple earth system

Gravitational potential energy changes into kineticenergy. The equation for gravitational potential energy is GPE = mgh, where m is the mass in kilograms, g is the acceleration due to gravity (9.8 on Earth), and h is the height above the ground in meters.

GPE = mgh

GPE = (0.5 kg) ( 9.8 m/s^2) (2.0 m)

GPE = 9.8 J

Wut 

There was no intial y-momentum so the net final y-momentum must also be 0. they can have final velocities in the y-direction