If each whole wiggle (wave) takes 0.29 seconds, how many times can it do a
whole wiggle in one second? (look at the
top of the screen)
f = 0.29 Hz
(it takes more than one second to make one
whole wave)
frequency = 3.4 Hz
(about 3 and a half waves per second)

moving ball hits still ball. mover stops, hit ball moves. momentum transfer.

the bal will not change its velocity.

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