Question

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.

Answer 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

Answer 2

-30 m/s backward