A) the driving force, drives the car in the direction of propagation of car
B) the resistive force acts opposite to the direction of propagation of car
C) zero
D) none of the above
Correct Answer: C
Solution :
Key Idea: Force on a body is the product of its mass and acceleration produced. \[Force=mass\times acceleration\] From Newton's second law of motion, the force (F) acting on a body moving with constant velocity (v) is given by \[F=mass\times acceleration\] We know that acceleration \[=\frac{dv}{dt}\] \[\therefore \] \[F\propto \frac{dv}{dt}\] Given, \[v=30\text{ }km/h\] \[\therefore \] \[F\propto \frac{d}{dt}(30)\] \[F=0\] Alternative: The external force on the body always produces some acceleration in the object. This implies there is a variable speed. As speed of car (object) is uniform, so there will be no net force on the car.
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