If 64 is term #1 of the sequence,
then the general term is
<em> T(n) = 50 + 14n </em>.
You need the kinematic equation for distance as a function of acceleration:
![d = [v(initial) *t] + 0.5a*t^{2}](https://tex.z-dn.net/?f=d%20%3D%20%5Bv%28initial%29%20%2At%5D%20%2B%200.5a%2At%5E%7B2%7D)
where a = gravitational acceleration 9.8m/s^{2}
v(initial) = starting velocity
t = time of fall
if the stone started at rest then v(initial) = 0 making the equation simply

Let me know if you still need further help :)
Answer:
c
Explanation:
electronic balance must always be at zero to prevent errors in measured value
Force= distance/time
Maybe that formula will help
Wave speed = fλ
=(5 x 10^14)(4 x 10^-7)
=2 x 10^8
Where f is the frequency and λ is the wavelength