For each of the following problems, give the net force on the block and the acceleration, including units. 40. ION
30 N
41
4N
5 kg
6N
4 kg
Net Force
a = F/m =
Net Force
a - F/m =
42
180 N
40 kg
43.
7N
140 N
Net Force =
Net Force =
2 kg
a
44
30 N
200 N
100 kg
17 N
Net Force
a

28. evolution

29. environment, survive, offspring  

explanation:

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