What happens when an object is dropped? a. its velocity at 2 seconds is 19.6 m/s. b. its velocity at 2 seconds is 9.8 m/s. c. its velocity at 2 seconds is 20 km/h. d. its velocity at 2 seconds is 22 mph.

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

false.

explanation:

this statement is false. after falling for 5 seconds, its speed will not be 100 m/s.