Answer:
20.7N
Explanation:
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Friction is caused by the uneven surfaces of touching objects
Weight equals mass times gravitational acceleration=400N, so mass=400/9.8=41kg approx.
Answer:
E = 0.437 N/C
Explanation:
Given that,
Charge, 
Electric force, 
Let the strength of the electric field is E. We know that, the electric force is given by :
F = qE
Where
E is the electric field strength

So, the strength of the electric field is equal to 0.437 N/C.