Answer:
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Answer:
35.36776 Hz
Explanation:
B = Magnetic field = 
= Maximum voltage = 20 V
d = Diameter of coil = 40 cm = 0.4 m
A = Area = 
N = Number of turns = 500
= Angular velocity
Maximum emf is given by

The angular velocity would be 35.36776 Hz
Do you have a diagram or anything?
Explanation:
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Average speed= total distance/total time =12km/h