For a freely falling object dropped from rest, what is the acceleration at the end of the fifth second of fall? the sixth second? at the end of any elapsed time t?

( specific heat capacity of water = 4200 J kg - 1 K - 1

specific heat capacity of copper = 390 J kg - 1 K - 1)

(a) If the temperature of the water rises from 15 °C to 35 °C, calculate the thermal energy gained by the water.

(b)

(i) State the thermal energy lost by the copper, assuming no heat is lost during its transfer.

(ii) Calculate the fall in temperature of the copper.

(iii) Hence calculate the temperature reached by the copper while in the flame.