Answer:
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Answer:
1 N
Explanation:
From coulomb's law,
The force of attraction between two charges is inversely proportional to the square of the distance between the charges.
From the question,
Assuming the charges are the same in both case,
F ∝ /r²....................... Equation 1
Fr² = k
F'r'² = Fr²........................... Equation 2
Where F' = First Force, r'² = First distance, F = second force, r² = second distance.
make F the subject of the equation,
F = F'r'²/r².................... Equation 3
Given: F' = 4 N, r' = 3 m, r = 6 m
Substitute into equation 3
F = 4(3²)/6²
F = 36/36
F = 1 N
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Answer:
200 km/h²
Explanation:
<em>Use the formula:</em>
acceleration = (final velocity - initial velocity) ÷ time taken
final velocity = 40 km/h
initial velocity = 30 km/h
time taken = 0.05 hours
<em>Substitute (plug in) the values into the equation:</em>
acceleration = (40 - 30) ÷ 0.05
acceleration = 10 ÷ 0.05
acceleration = 200 km/h²
