Average speed is the ratio of total distance moved by Chi in total time interval
So here we will have
Total distance = 100 m + 400 m

Total time taken = 5 min + 15 min = 20 min

now by the formula of average speed we know that



so average speed will be 1.5 km/h
It's Photoelectric Effect, I just a test with this same question. I am not good for explaining exactly how, but I was right.
Potential energy is energy that is found in a system, grounded on the position of objects. The Coulomb (C) is the unit of charge, and the unit of electric potential is the Volt (V), which is equivalent to (J/C) or Joule per Coulomb.So the formula for this is potential = kQ / d, plugging in the given from the questions will give us:potential = 8.99e9N·m²/C² * 1.602e-19C / 0.053e-9m = 27 V
Answer:
For the car to move with constant velocity the additional force required is 
Explanation:
From the question we are told that
The net force of the car is 
Generally the total force acting on the car is the net force plus the force due to gravity acting in direction of the car (Let denote it as
)
So the total force acting on the car is mathematically represented as

Here this F representing the total force can be mathematically represented as

Now for constant velocity to be attained, the acceleration of the car will be zero
So at constant velocity

=> 
So

=> 
=> 
Answer:
2.83m
Explanation:
The information that we have is
Intensity at 2.0 m:
and 
we need an intensity level of: 
thus, we are looking for the distance
.
which we can find with the law for intensity and distance:

we solve for
:

and we substitute the known values:

at a distance of 2.83m the intensity level is 40dB