A radio-controlled car increases its kinetic energy from 4 j to 12 j over a distance of 2 m. what was the average net force on the car during this interval?

Question

Physics

Johnston

17 September, 07:04

A radio-controlled car increases its kinetic energy from 4 j to 12 j over a distance of 2 m. what was the average net force on the car during this interval?

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Xiomara Walsh · Answer 1

The answer to this is easy once you look at the units for Joules. 1 Joule = 1 N. m (Newton. meter). The 'Newton' is the units of force that we are trying to find, and we know the meters is 2, from the question. So you have an 8Joule or 8N. m energy difference over 2 meters.

well if we know the meters, then the real question is written as:

8N. m = ? N x 2m

so just solve for N;

N = 8N. m / 2m = 4

So F = 4N