An object is thrown up at an angle of 40.0 degree above the horizontal and reaches a maximum height H.

If the angle is now doubled to 80.0^degree, but nothing else is changed, its maximum height will be

a. 1.67 H.
b. 2.00 H.
c. 2.35 H.
d. 4.00 H.

The maximum height reached is proportional to (V^2/g) sin^2 theta

V and g do not change.

Calculate the ratio (sin80/sin40)^2

That, times H, will be the answer.