Answer:
28716.4740661 N
1.2131147541 m/s
51.2474965841%
Explanation:
m = Mass of plane = 74000 kg
s = Displacement = 3.7 m
f = Frictional force = 14000 N
t = Time taken = 6.1 s
u = Initial velocity = 0
v = Final velocity

Force is given by

The force with which the team pulls the plane is 28716.4740661 N

The speed of the plane is 1.2131147541 m/s
Kinetic energy is given by

Work done is given by

The fraction is given by

The teams 51.2474965841% of the work goes to kinetic energy of the plane.
I believe you are right. pH is the concentration of H+. Therefore the more acidic the more H+.
Answer:
use the formula for option B ( d/t = s )
and
look at the graph representation to explain
Electrons move from the atoms in the cloth to the atoms in the balloon, causing the balloon to have a negative charge
Hope this helps!!!