A : A nebular cloud of dust and gas is the correct answer.
Answer:
1 second
Explanation:
The impulse exerted on the boy is equal to its change of momentum:

where
F = 500 N is the push on the boy
is the contact time
m = 25 kg is the mass of the boy
is the change in velocity of the boy
Solving the formula for the contact time, we find

It is a solid substance that has a conductivity between that of an insulator and that of most metals, either due to the addition of an impurity or because of temperature effects
The ball was moving for 0.8seconds
This is because 4/5 x 1 = 0.8
Hope this helps and good luckkkk :)
If it does do it then yeah it will for it