Until a train is a safe distance from the station it must travel at 5 m/s. once the train is on open track it can speed up
to 45 m/s. if it takes a train 8 seconds to reach 45 m/s, what is the acceleration of the train? (round your answer to
the nearest whole number)
o 4 m/s2
o 5 m/s2
o 6 m/s2
o 7 m/s2
intro

5 m/s^2

Explanation:

Initial Velocity: Vi = 5 m/s

Final Velocity: Vf = 45 m/s

Time taken from initial velocity  to reach final velocity: t = 8 sec

Since we know Acceleration: a = (Vf - Vi)/t

So a = (45 m/s - 5 m/s) / 8 s

     a = 40 m/s / 8 s

     Acceleration: a = 5 m/s^2

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000