Answer
d. 2 m.
Work Step by Step
The balls have the same initial velocity in the x direction and will maintain the same velocity throughout the fall.
The balls will also accelerate downwards at the same rate. This acceleration is in the y direction and will not affect the balls' x velocities. This means they will spend the same time in the air.
The distance in the x direction can be calculated as, \(d_x= v_x*t_x \)
\(v_x\) and \(t_x\) are the same for both balls therefore \(d_x\) is the same for both.
Therefore both balls will travel 2 m.