An f-15 supersonic fi ghter aircraft is in a rapid climb. at the instant it passes through a standard altitude of 25,000 ft, its time rate of change of altitude is 500 ft/s, which by defi nition is the rate-of-climb, discussed in ch. 6. corresponding to this rate-of-climb at 25,000 ft is a time rate of change of ambient pressure. calculate this rate of change of pressure in units of pounds per square foot per second.

think its the third option

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