Does anybody know about free fall for physics

61.74 m/s

Explanation: Use the first equation for free falling bodies

a = vf - vi / t

Derive for vf:

vf = at + vi ( vi = 0 since it starts from rest)

Substitute the values

vf = 9.8 m/s² x 6.3 s

= 61.74 m/s

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

option number c is the right answer.