First slide

Power

Question

A vehicle is moving on a horizontal road at a constant speed of t0 m/s. The engine needs to spend 5 k J energy
per second. What is the force on the vehicle ?

Easy

A

50 k N
B

5 k N
C

0.5 k N
D

0.05 k N

Solution

$P = \frac{Work done}{time} = \frac{Force \times distance}{time} = F \times V 5 k W = F \times 10 or F = 0 .5 k N$

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