Im not sure but it might be the last option: it gives reasons to be believed and trusted
Answer:
Change in Displacement
Explanation:
delta/triangle = change
x = displacement
formula (if needed): final x - initial x
Answer:
The force the skater exerts is 50 N
Direction: towards wall
Explanation:
The impulse is equal to:
The average force is:
Where
vf = final speed = -1 m/s
vi = initial speed = 0
m = mass = 40 kg
Δt = time interval = 0.8 s
Replacing:
(force applied by the wall)
The force the skater exerts is
Fsk = -Fave = -(-50) = 50 N
Direction: towards wall
Answer:
B. Repel each other
Explanation:
Two like charges have the same sign. Example an electron with a negative charge (-e) and another electron with same charge(-e). Or a proton with a positive charge (+e) and another proton with same charge (+e). Since each of these pair charges have the same sign, they will repel each other.
On the other hand, if the charges are opposite, ie negative charge and positive charge, they will attract each other.
B. Repel each other
