A train moving at applies its brakes and comes to a stop in while decelerating uniformly

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A train moving at

90\,\text{km/h}

applies its brakes and comes to a stop in

400\,\text{m}

while decelerating uniformly. What is the magnitude of the train’s acceleration during this interval? (a)

1.6\,\text{m/s}^2

(b)

3.1\,\text{m/s}^2

(c)

0.78\,\text{m/s}^2

(d)

0.39\,\text{m/s}^2