3. A 12 500 kg locomotive, the beloved Hooterville Cannonball, starts at rest an

Question

3. A 12 500 kg locomotive, the beloved Hooterville Cannonball, starts at rest and ends up zooming towards you with a constant velocity of 85.0 km/h. (a) What is the kinetic energy of the locomotive? (b) The locomotive accelerated from rest at 3.50 m/s2, so, what distance was required to reach the final velocity? (c) How much time did it take? (d) The whistle produces a frequency of 565 Hz, so what frequency do you hear if it is traveling at the 85.0 km/h?
Need these answers to study!! Much appreciated in advanced!

Explanation / Answer

v=85 km/h = 23.61 m/s a) 0.5*m*v^2= 0.5*12500*23.61^2 = 3484278.55 J b)v^2 = u^2 -2*a*s u=0 s= 23.61^2/(2*3.5) = 79.63 m c) v=u+a*t t= 23.61/3.5 = 6.75 sec d) sorry, don't know

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