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physics

The driver of a train traveling at 30 m/s applies the brakes when he passes an amber signal. The next signal is 1.5 km/h down the track and it reaches 75 seconds later. Assuming uniform acceleration, find the velocity of the train at the second signal.

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  1. v = 30 - a (75)

    assume you mean 1.5 km or 1500 meters

    1500 = 30 (75) - .5 a (75)^2
    solve for a
    then go back and get v at 75 seconds

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  2. -30 m/s backward

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