Answer:
0.85V
Explanation:
The emf is calculated by using the Lenz's Law

But for this case we have that the magnetic field is constant. Hence we have

where we have taken that the intial time is t1=0
I hope this is useful for you
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Answer:
-39.2m/s
Explanation:
Using the equation of motion;
v = u + at
Since the ball is thrown upward, the acceleration due to gravity acting on it will be negative, hence a = -g
v = u - gt
Since g = 9.8m/s²
t = 4.0s
u = 0m/s
v = 0 + (-9.8)(4)
v = 0 + (-9.8)(4)
v = -39.2m/s
Hence the speed of the ball before release is -39.2m/s
I think it's The fossil record. The same animal fossil is in Africa and South America. The animal could have not swim across so its the fossil record