Question

a lawnmower engine running for 20 min does 4,560,000 j of work. what is the power output of the engi (power: p = w/t)
3800 w
228,000 w
91,200,000 w
547,200,000 w

Explanation:

Step1: Convert time to seconds

$t = 20\times60\ s=1200\ s$

Step2: Calculate power using formula

$P=\frac{W}{t}=\frac{4560000\ J}{1200\ s}=3800\ W$

Answer:

A. 3800 W