The correct answer is 144 KJ .
Work power, or simply power, is referred to as a physical notion that, depending on the situation and the information at hand, may have a variety of interpretations. The rate of performing labour is referred to as power. Power is defined as the amount of energy used per unit of time. Since it lacks a direction, it is present in scalar amount. Joules/second, or Watt in the SI system, is the unit of power. A watt is the amount of energy required to perform one joule of work in a second.
P = 120 Watts of power
20 minutes plus 60 seconds equals 1200 seconds.
taken t and Energy E= Power P x Time t.
= Work W (or Energy E)/Time
since we know that Power P
Energy E= 120 W x 1200 = 144000 J or 144 KJ
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