Really Quick Work Done Q (I've tried)

JohnJay · Nov 6, 2007

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?

P = W x T

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

Astronuc · Nov 6, 2007

JohnJay said:

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

Well, one has acceleration 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