An electric heater rated 220v, 1000 w is immersed into a bucket full of water, calculate the mass of water if the temperature changes from 30°c to 100°c and the current flows for 300seconds.

[specific heat capacity of water = 4200 jkg^-1 K^-1]

• A.4.28 kg
• B.42.86 kg
• C.1.02 kg
• D.7.14 kg
• E.