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Explanation:
F1=m(w1^2 y)
F2=m(w2^2 y)
under action of both forces
F=F1+F2
m(w^2 y)=m(w1^2 y)+m(w2^2 y)
w^2=w1^2+w2^2
(2pi/T)^2=(2pi/T1^2)+(2pi/T2^2)
1/T^2=1/T1^2+1/T2^2
T^2=T1^2×T2^2/T1^2+T2^2
T^2=((4/5)^2×(3/4)^2) / (4/5)^2+(3/4)^2
T^2=16/25×9/16 / 16/25+9/16
T^2=9/25 / 256+225/400
T^2=9/25 / 481 /400
T^2=9/25 ×400/481
T^2=144/481
T=0.55=55/100=11/20 sec
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