If the magnetic field strength in the spectrometer is increased, will the spacing between where the 235u and 238u ions strike increase, decrease, or stay the same?

To answer this item, it must be noted that the magnetic field between two objects is directly proportional to the product of their masses or charges, and inversely proportional to the distance. When the magnetic field between them is increased, the distance between them was also decreased. 

Explanation:

Given

launch velocity

Launch angle

Range of Projectile

Horizontal velocity remain same and only vertical velocity changes.

Initially  vertical  velocity is in upward direction but as soon as it reaches the ground its direction change but magnitude remain same.