The radius of the satellite’s orbit around the center of the earth is r = 7 r , where r is the radius of the earth. neglect the rotational kinetic energy due to the earth's rotation. find the energy required to launch a satellite from earth into the circular orbit at the specified radius r = 7 r. answer in units of j. hint: you may find it useful to take into account that the gravitational force is a conservative force. hint: the universal gravitational force law is: f = g[mm/r^2](r hat)

f=ma newton's second law 7x8=56n

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