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Aperson is suffering frm an eye defect uses lenses of power 2d .nmae the defect he is suffering frm and the nature of the lens used. what is the focal lenght of the lens used​

Two springs a and b are stretched by applying forces of equal magnitude

Aparticle moving along a straight line has a velocity v m/s , when it cleared a distance of x meters. these two are connected by the relation v= root 49+x find the acceleration of the particle in m/s square when its velocity is 1 m/s