Really Quick Work Done Q (I've tried)

[JohnJay]

Homework Statement

A net force of 14 N accelerates a 9 kg mass over a distance of 8 m.

What is the increase in kinetic energy of the mass?

Homework Equations

P = W x T

The Attempt at a Solution

8 x 14
-----
9 = 12.44 but its wrong

 

[Astronuc]

8 x 14
-----
9 = 12.44 but its wrong

Well, one has accleration times distance, but something is missing, like a factor of 2. Then that would give one the change in the square of the velocity.

KE = 1/2 mv²


Handy reference for some basic equations of motion - http://hyperphysics.phy-astr.gsu.edu/hbase/mot.html#mot1

More specifically for this problem - http://hyperphysics.phy-astr.gsu.edu/hbase/mot.html#mot5

 

[ogb p]

I appreciate your attempt at solving this problem. However, your equation and solution are incorrect. The equation for calculating kinetic energy is KE = 1/2 x mass x velocity^2. In this case, the velocity is not given, so we cannot calculate the increase in kinetic energy. We would need to know the initial and final velocities of the mass in order to accurately calculate the change in kinetic energy. Additionally, the net force and distance are not directly related to kinetic energy, so your attempt is not a valid approach to solving this problem. I recommend reviewing the concept of kinetic energy and its equation to better understand how to solve this type of problem.