Answer:
p to the left
Explanation:
According to law of conservation of momentum "total momentum of an isolated system remains constant".
we consider astronaut and astronaut drill as an isolated system. If the drill gain momentum p to the right so in order for momentum to remain constant the astronaut will gain the same momentum but in opposite direction i.e momentum p to the left.
Initial momentum = 0 ( before she throw astronaut belt)
Final momentum = p - p = 0 (After she throw astronaut belt)
Hence momentum of the system remains constant i.e zero.
Answer:


Explanation:
Given:
time of constant deceleration, 
A.
initial angular speed, 
<u>Using equation of motion:</u>



B.
Using eq. of motion for no. of revolutions, we have:



Explanation:
time spent to run from house to school=100/5=20s
time spent to return from school=100/10=10s
average velocity=200m/(10+20)
Scientific Notation: 4.580 x 10^-4
Scientific e Notation: 4.580e-4