A plane has a speed of 275 km/hr. The wind is in the opposite direction as the plane with a speed of 75 km/hr. What is the combined speed? A. 350 km/hr
B. 309 km/hr
C. 200 km/hr
D. 264 km/hr

I would say A

Explanation:

connect the batteries in series and hope

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s