It was tied in with some kinematics stuff but I couldn't figure it out for the life of me.

Info given:

Mass of a train (kg)

Speed of train (km/h, convert to m/s)

Brake is applied with a force (given in N)

Brake is applied for time (s)

Find the final velocity after braking for t seconds.

It was literally the first question on the test. I tried almost everything I could think of. The first (and most logical) thing I tried was taking the force of the brakes and dividing by the mass of the train to get the acceleration, then just plugging that into a kinemeatics equation, Vx=Vox + a*t, but that didn't get me anything close to any of the multiple choice answers.

Any ideas?

Last edited: Dec 14, 2007