Question

which formular do to use to calculate distace in newton's law if i have height and angle?

Answer 1

horizontal distance or vertical distance?

You need to provide a bit more context. For a nice discussion of any trajectory, see

https://en.wikipedia.org/wiki/Trajectory

Answer 2

(a) What do you understand by the term inductive reactance?

Answer 3

For a resistor
V = R i

for an inductance L where w = 2 pi f

V = L di/dt
if i = sin wt for example
then di/dt = w cos wt
and
V = (L w) i

The L w is called reactance , sort of like "resistance" the ratio of voltage to current