Answer: its the second (B) option, n1sintheta1=n2aintheta2
theta is the thing that looks like a 0 with the across.
Explanation: I got it right
Explanation:
It is given that,
The Displacement x of particle moving in one dimension under the action of constant force is related to the time by equation as:

Where,
x is in meters and t is in sec
We know that,
Velocity,

(a) i. t = 2 s

At t = 4 s

(b) Acceleration,

Pu t = 3 s in above equation
So,

Hence, (a) (i) v = 55 m/s (ii) v = 211 m/s and (b) 78 m/s²
I am thinking about the law of gravitation
Protons are positive, and neutrons are negative, electrons are neutral. I’m not sure about the rest but I hope that helps for now
because it is like when pigs get in mud they stay cooled like sun screen