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Use the formula
a = V^2/r
for both questions. Make sure V is in meters per second. 216 km/h = 60.0 m/s
In the first case, choose a = 0.07 m/s^2 and the V above to solve for r.
In the second case, choose a = 0.07 m/s^2 and r = 1600 m and solve for V.