Dana is on a train traveling at a speed of 20 km/h. dana walks from the front of the train to the back of the train at a speed of 4 km/h. what is dana’s speed relative to the ground?

a.) 20 km/h
b.) 12 km/h
c.) 16 km/h
d.) 24 km/h

Option C

16 Km/h

Explanation:

Dana is moving in opposite direction compared to the train.If we denote w-velocity of train with respect to ground and u- velocity of passenger with respect to train and v-velocity of passenger we can using classical mechanics claim that v = w-u

v=20-4=16 km/h

with the invention of the automobile, the woman of the house could drive to the store and get groceries. women were also free to socialize more. during world war ii women were allowed to work in factories to the war effort and could drive to work or ride mass transit buses to their jobs.