In a location where the train tracks run parallel to a road, a high-speed train

Question

In a location where the train tracks run parallel to a road, a high-speed train traveling at 60 m/s passes a car traveling at 30 m/s. How long does it take for the train to be 180 m ahead of the car? a) 2.0 s b) 3.0 s c) 6.0 s d) 9.0 s e) 18.0 s A jet cruising at a velocity of 900 km/h due East, ejects hot air in the opposite direction (due West). If the speed of the hot air with respect to the jet is 800 km/h, find its velocity with respect to the ground. a) 1700 km/h, due East b) 1700 km/h, due West c) 100 km/h, due East d) 100 km/h, due West e) impossible to tell With what initial velocity do you need to throw a rock vertically upward from the ground, so it reaches maximum height of 15 m? Ignore air resistance a) 10 m/s b) 14 m/s c) 17 m/s d) 20 m/s e) 25 m/s

Explanation / Answer

According to the chegg guidelines I am allowed to answer only 1 question at a time.

1) t =180 seconds s1 = 60 m/s s2 = 30 m/s

( 60 + 30 ) * t = 180 m

t = 180 m / 90.0 m/s

t = 2.00 seconds ============================ANSWER) OPTION A)

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