2007-05-19 06:09:43 · 6 answers · asked by JT78 1 in Science & Mathematics ➔ Physics
mass*velocity
convert velocity into metres per second first though.
2007-05-19 06:15:55 · answer #1 · answered by Anonymous · 0⤊ 0⤋
The work function W = Fd; where F is the force acting over d distance. F = ma; where m is the mass = 1,500 kg and a = deceleration. Thus, W = mad.
0 = u^2 - 2ad; where u = 72 kmh and a = W/md from above. Thus we have u^2 = 2(W/md)d = 2W/m; and lo and behold W = 1/2 mu^2, the oft used equation for kinetic energy.
Just plug in m = 1500 kg and u = 72 kmh and you can do the math.
Lesson Learned: The work to stop a moving object is equal to the kinetic energy it had to start with.
2007-05-19 13:21:26 · answer #2 · answered by oldprof 7 · 0⤊ 0⤋
Work units are Newton Meters. (force times distance)
You have mass and velocity... force is mass * acceleration
I think there needs to be an acceleration componant to your question
2007-05-19 13:17:12 · answer #3 · answered by Holden 5 · 0⤊ 0⤋
None, You could stop it with a brick wall and work is mass times displacement, Displacement is not needed to stop it.
2007-05-19 13:19:12 · answer #4 · answered by pechorin1 3 · 0⤊ 0⤋
applied force will turn its kinetic power to 0..and that is the work done. 72km/h=20m/sec.
1/2mvv
=300000joules
2007-05-19 13:20:59 · answer #5 · answered by arnab b 2 · 0⤊ 0⤋
Hahahaaha...Rather let's talk about my hat. Do you like it?
2007-05-19 13:12:11 · answer #6 · answered by Anonymous · 0⤊ 0⤋