Question

A vehicle is moving on a straight horizontal road at a constant velocity of 10 m/s. The engine needs to spend
4 kJ of energy per second. The force on the vehicle is
(1) 0.2 kN
(2) 0.4 kN
(3) 0.6 kN
(4) 1N​

Answer 1

Answer:

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Explanation:

According to work energy theorem, the work done by the car is zero. Since the kinetic energy does not change and the car is moving along a straight horizontal road the work done is zero only if there is no non conservative force like friction. If there is friction then work done will be force into displacement.

Answer 2

Answer:

$energy = work \: done = 4kj = 4000j \\ time = 1s \\ power = \frac{workdone}{time} = 4000w$

$power = \frac{work \: done}{time} = \frac{force \times distance}{time} = force \times velocity \\ = > 4000w = force \times 10 \\ = > force = 400n = 0.4n$

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