Question

A car of mass 1000 kg travels at 12 m/s on a horizontal and the resistance to motion is 500 N. Find (c) the power developed by the engine.

Answer 1

Step 1: Given data

Mass of the car is, $m=1000kg$

Velocity is, $v=12m/s$

Resistance (force) is, $F=500N$

Step 2: Calculating power

Power is given as,

$P=Fv$

where, $F$ is force and $v$ is velocity.

Substituting the known values, we get,

$$\begin{gathered} P=500N\times 12m/s \\ P=6000W \\ P=6.0kW \end{gathered}$$

Therefore, the power developed by the engine is $6.0kW$.