You don't have any units for the coefficients so I don't know where you are but the formula to use is
(dL/L)= k*dT
So plug in dL and L in the proper units and the 25 and solve for dT. Knowing it is 20 at the end calculate the initial T.
the length of an aluminium bar of length 80cm increases by 1mm on heating.what is the final temperature of the bar if it was initially at temp 20 degree celsius? coeff. of linear expansion of aluminium=25
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