In a museum exhibit, three equal weights of 40.0 N are hung with identical wires, as shown. What is the tension in wire 2? A. 40.0 N
B. 120.0 N
C. 60.0 N
D. 80.0 N

A

Explanation:

because when they are parrallel it remain the same

less than one you can't create energy

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