B. 100% sure
Have a good day/night
Answer:
I think it's D!!
cuz protons are in the atoms
Isn't velocity Distance over time? if the degree isn't adding resistance it should be 4000 ÷ 20 which gives you 200mps ("per second") which is the velocity without resistance.
Answer:

Explanation:
For pendulum A: Length = L and gravity = g
The frequency of pendulum A is given by

Here, f is the frequency, L be the length
... (1)
For pendulum B: Length = 2L, gravity = g
The frequency of pendulum B is given by
.... (2)
Divide equation (1) by (2)
