Answer to Question #148708 in Mechanics | Relativity for julia

Question

A certain car can go from 0 to 100 km/h in 10 seconds. If the engine delivered twice the power to the wheels, how many seconds would this car take to accelerate from 0 to 100 km/h? No math is needed for this question! Briefly explain your answer.

Answer 1

It will take 5seconds if the engine delivered twice the power to the wheels.

The time rate of work done is called power

$P=\frac {W}{T}$

This is because increasing engine power twice will reduce the work done to cover he thus reducing the time taken to cover the distance.