Answer:
0.50
Explanation:
The maximum height is given by [tex]h=\frac{u^2sin^2\Theta }{2g}[/tex] here h is the maximum height u is the initial velocity and [tex]\Theta[/tex] is the angle of projection
So we can see from the relation that height is universally proportional to the gravity now in question it is given that the planet has the twice the surface gravity than the earth so the height will be half