Answer:
I think u are traeling at speed of light and not ur friend
Explanation:
The time
it takes for the key to fall 44 m is

(notice I'm taking the downward direction to be positive)
The boat, moving at a presumably constant speed, then has 3.0 s to travel 19 m to the point of impact, which means its speed must be

Answer:
v =163.95 m/s
Explanation:
Given that,
The wavelength of wave, 
Distance covered, 
We need to find the speed of the wave. We know that,
speed = distance/time
So,

So, the speed of the wave is equal to 163.95 m/s.
Answer:
(a). The speed of car will increases.
(b). The speed of car will decreases.
Explanation:
Given that,
A car is traveling from your left to your right at a constant velocity.
We need to find two actions could the driver take
Using given data
(a). If the velocity and acceleration of car to the right
It means the velocity and acceleration of car is in same direction then the speed of car will increases.
(b). If the velocity to the right and the acceleration to the left
It means the velocity and acceleration of car is in opposite direction then the speed of car will decreases.
Hence, (a). The speed of car will increases.
(b). The speed of car will decreases.
C. OUTER CORE
Scientists think that the outer core, made of liquid iron and nickel, moves to produce Earth's magnetic field.
The outer core lies between the solid inner core and mantle. It is a fluid layer that is 2,300 km think.