Question

An ox can apply a maximum force of $1000N$. It is taking part in a cart race and is able to pull the cart at a constant speed of $30m{s}^{-1}$ while making its best effort. Calculate the power developed by the ox.

• A. $30W$
• B. $30kW$
• C. $300kW$
• D. $30000kW$

Answer 1

The correct option is B $30kW$

$Power=work/time$
$Work=F\times S$
$Power=F\times S/t$
$Power=F\times v$, where v is the velocity as it is rate of change of displacement.
$P=1000\times 30=30kW$.