Object A has a mass of 8.0 kg and is accelerating at 4.0 m/s2. Object B has a mass of 10.0 kg and is accelerating at 3.0 m/s2. Object C has a mass of 7.0 kg and is accelerating at 5.0 m/s2. Place the objects in increasing order according to the net force they are experiencing. a. A, B, C
b. B, A, C
c. C, B, A
d. C, A, B

b. B, A, C

Explanation:

To solve this problem, let us find the net forces they are experiencing.

 Net force  = mass x acceleration

Object A;  mass  = 8kg and acceleration  = 4m/s²

                 Net force  = 8 x 4  = 32N

Object B;  mass  = 10kg and acceleration  = 3m/s²

                 Net force  = 10 x 3  = 30N

Object C:   mass  = 7kg  and acceleration  = 5m/s²

                   Net force  = 7 x 5 = 35N

So, increasing order of their net force;

              B < A < C

its c i just checked it

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