A=mgh
m=300g=0.3kg
g=9,81 m/s^2
h=10m
A=29.43J
Answer: b
Explanation: the two pieces will repel as both have obtained a static charge.
velocity = traveled distance ÷ time of the traveled distance is seconds
velocity = 600 ÷ 60
velocity = 10 m/s
_________________________________
Kinetic Energy = 1/2 × mass × ( velocity )^2
KE = 1/2 × 60 × ( 10 )^2
KE = 30 × 100
KE = 3000 j
