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diff --git a/569/CH4/EX4.15/4_15.sci b/569/CH4/EX4.15/4_15.sci
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+// Calculate natural frequency and setteling time
+clc;
+K=60*10^3;
+M=30;
+wn=(K/M)^0.5;
+disp(wn,'natural frequency (rad/sec)')
+eta=0.7;
+ts=4/(eta*wn);
+disp(ts,'setteling time (s)')
+\ No newline at end of file