T-20

The temperature dependence of the emf of a standard electrochemical cell is given by E=1.02-4.0xx10^(-5) (T-20)-9.0xx10^(-7) (T-20)^(2) where, T is in .^(@)C and E is in volts. The temperature coefficient of the emf at 30^(@)C is :

vec(r)=15t^(2)i+(20-20t^(2))j find magnitude of acceleration at t=1 sec.