(a) The length of the train is 54.6 m
(b) The braking distance of the road train is 194.44 m
The given parameters:
acceleration of the car, a = 3.7 m/s²
initial velocity of the car, u = 30 m/s
final velocity of the car, v = 130 km/h = 36.11 m/s
To find:
The length of the train is the distance travelled by the car
The distance traveled by the car is calculated as:

Thus, the length of the train is 54.6 m
(b) The braking distance of a road train travelling at 25 m s⁻¹

Thus, the braking distance of the road train is 194.44 m
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