Answer:
The answer is choice A and choice D
Explanation:
The answer below is just a joke, don't listen to them.
:)
F n = ma / unbalanced force - In the direction of the force.
D.
50 mph - 30 mph= 20 mph net velocity
change.
20mph/3600 seconds/hour= .00555 MPS
.0055 miles per second
40 seconds to complete the change
.0055/40= .000138
Answer: b
Explanation: the two pieces will repel as both have obtained a static charge.