Abody moves on a coordinate line such that it has a position sequalsf(t)equalsstartfraction 25 over t squared endfraction minusstartfraction 5 over t endfraction on the interval 1less than or equalstless than or equals5, with s in meters and t in seconds. a. find the body's displacement and average velocity for the given time interval. b. find the body's speed and acceleration at the endpoints of the interval. c. when, if ever, during the interval does the body change direction?

an energy transformation flow diagram is shown

where is it ?

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