A Projectile of Mass 0

Multiple Choice

A projectile of mass 0.50 kg is fired with an initial speed of 10 m/s at an angle of 60° above the horizontal.The potential energy of the projectile-Earth system when the projectile is at its highest point (relative to the potential energy when the projectile is at ground level) is:

A) 25 J
B) 18.75 J
C) 12.5 J
D) 6.25 J
E) none of these