Answer:
gexp = 3.65 m/s²
Explanation:
The value of acceleration due to gravity changes with the altitude. The following formula gives the value of acceleration due to gravity at some altitude from the sea level:
gexp = g(1 - 2h/Re)
where,
gexp = expected value of g at altitude = ?
g = acceleration due to gravity at sea level = 9.8 m/s²
h = altitude = 2000 km = 2 x 10⁶ m
Re = Radius of Earth = 6.37 x 10⁶ m
Therefore,
gexp = (9.8 m/s²)(1 - 2*2 x 10⁶ m/6.37 x 10⁶ m)
<u>gexp = 3.65 m/s²</u>
C) water is the answer i believe
Answer:
Value of acceleration in each case is 
Explanation:
According to newton's law :
...equation 1.
In the given case,
Force by both the children - Friction force .

Putting value of F in equation 1.

Now, if friction force = 20 N.
Therefore, 
Putting value of F and a in equation 1.

Hence , this is the required solution.
they travel the speed of light or 300,000 km per second