In a automobile brake test the driver slammed on the brakes to see how long it would take the car to stop completely. see the graph. about what was the average speed of the car during the first 2 seconds of braking? a) 41 m/s b) 50 m/s c) 72 m/s d) 80 m/s

less than one you can't create energy

c) up

hope this

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