The length of the giving swinging pendulum is; B: 55.9 centimeters
The formula to find the period of a swinging pendulum is;
T = 2π√(L/g)
where;
T is period
L is length
g is acceleration due to gravity = 980 cm/s²
We are given;
T = 1.5 s
Thus;
1.5 = 2π√(L/980)
(1.5/2π)² = L/980
L = 980 * (1.5/2π)²
L = 980 * 0.057
L = 55.9 Centimeters
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