A passenger walks forward inside a train at relative to the floor of the train

PHYSICS · Subjective · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A passenger walks forward inside a train at

1.2\,\text{m/s}

relative to the floor of the train. A trackside observer measures the passenger’s speed to be

9.0\,\text{m/s}

forward relative to the ground. Determine the speed of the train relative to the ground. Give magnitude and direction.