Question

Please solve q 10?

Answer 1

Assuming the materials of the tyres of the two vehicles are identical - i.e. the coefficient of kinetic friction between the tyres and the ground are the same, the truck will stop over a smaller distance.

Explanation:

Once the brakes are applied, the wheels stop rotating and the friction between them and the ground becomes kinetic friction. If the coefficient of friction is the same for the two vehicles, the force is greater for the truck (because of its greater weight and hence greater normal force acting on it). Since the work done by friction in both the cases are the same (equal to the kinetic energy of the two vehicles), the truck will cover a smaller distance.

Of course, if the retarding forces were equal for some reason, both the vehicles would have covered the same distance before stopping.