Question

The power $(P)$ of an engine lifting a mass of $100\,kg$ up to a height of $10\,m$ in $1\,\min$ is

• A. P=163.3 W
• B. P=9800 W
• C. P=10000 W
• D. P=5000 W

Answer 1

Answer: (A)

P=163.3 W

Answer 2

Power $=\frac{\text { Work done }}{\text { Time }}$
Work done $=m g h=100 \times 9.8 \times 10$
Time $=1 \min =60\, s$
$\therefore P=\frac{100 \times 9.8 \times 10}{60}$
$=163.3\, W$