Aperson began running due east and covered 15 km in 2.0 hr. what is the average velocity of the person?

The average velocity is 7.5 km per hour eastward.

Explanation:

(Average speed km/h) = (distance made in km) / (total time in h).

Speed = 15 km / 2 h = 7.5 km/h

Velocity is speed with direction. The direction of the person is "east" therefore the average velocity is 7.5 km/h eastward.

The average velocity is 7.5 km per hour eastward.

Explanation:

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