Answer:
speed =distance/time taken
5 m/s
If resistors are connected in series then total resistance=2+2+2+2+2
=10 watt
if connected in parallel then total resistance,1/R=1/2+1/2+1/2+1/2+1/2
1/R=5/2
So R=2/5
R=0.4w
For number 52, 1kg=1000 g
So, if she has 750 grams:
1,000g-750g= 250g
She would need 250g more soil
If a = 23 and b = 45
a + b = ?
23 + 45 = 68
Explanation:
It is known that relation between velocity and height is as follows.
v = 
where, g = acceleration due to gravity = 9.8 
h = height = 0.2 m
Therefore, velocity is calculated as follows.
v = 
= 
= 3.92 m/s
Also,


Putting the given values into the above formula as follows.

= 
= 
=
m/s
or, =
m/s
Thus, we can conclude that recoil speed of the Earth is
m/s.