A 20-Kg Projectile Moves from Its Initial Position to a Point

Multiple Choice

A 2.0-kg projectile moves from its initial position to a point that is displaced 20 m horizontally and 15 m above its initial position.How much work is done by the gravitational force on the projectile?

A) +0.29 kJ
B) -0.29 kJ
C) +30 J
D) -30 J
E) -50 J