Planet x has the half the size of earth and a density three times that of the earth. determine the acceleration due to gravity on planetx select one: 9/2 2g/3 39/2 2g 3

Explanation:

As we know that the acceleration due to gravity is given as

now we know that mass is the product of density and volume

so we will have

Now we have

now size of new planet is half that of size of Earth and the density is 3 times the density of Earth

so we have

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