(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A fancart of mass 0.8 kg initially has a velocity of < 0.7, 0, 0 > m/s. Then the fan is turned on, and the air exerts a constant force of < -0.4, 0, 0 > N on the cart for 1.5 seconds.

What is the change in momentum of the fancart over this 1.5 second interval?

What is the change in kinetic energy of the fancart over this 1.5 second interval?

2. Relevant equations

K = 1/2mv^{2}

K = p^{2}/2m

3. The attempt at a solution

I got the change in momentum. It's <-.6,0,0>

I can't find the change in kinetic energy.

I tried K = 1/2mv^{2}and got 0.196

I also tried p^{2}/2m and got 0.225

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Kinetic energy of a kart

**Physics Forums | Science Articles, Homework Help, Discussion**