Answer:

Explanation:
r = Rate of flow of charge = 20000 C/s
t = Time taken = 100 μS
Charge is given by

The charge that flows between the ground and the cloud in this time is 2 C
Number of electrons is given by

The number of electrons is 
Answer:
a = 200 m/s²
Explanation:
Given,
The initial speed of rocket-powered sled, u = 0
The final speed of rocket-powered sled, v = 440 m/s
Time taken to reach final speed, t = 2.20 s
The acceleration of the body is given by the change in velocity by time
a = (v - u) / t
= (440 - 0) / 2.20
= 200 m/s²
Therefore, the acceleration of the rocket-powered sled, a = 200 m/s²
I believe it is Acoustics, the real name for it would be like Reverberation. But go with Acoustics. :)
Answer:
a. Velocity
Explanation:
The slope of the tangent line on a position-time graph is the instantaneous velocity.