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# A car is moving with a constant speed of $20 ms^{-1}$ against a resistive force of $100 \;N$. The power exerted by the car is

$(a)\;2\;KW \quad (b)\;5\;W \quad (c)\; 200 \;W \quad (d)\;1\;KW$
Can you answer this question?

Power $P=F.v$
$\qquad\quad =100 \times 20$
$\qquad\quad=2 KW$
Hence a is the correct answer.

answered Aug 6, 2013 by
edited Feb 10, 2014 by meena.p