A student is about to launch a 0.1kg rock from a sling shot as shown. The natural length of the spring is shown in the insert. The initial time is defined as just before the launch when the student has pulled the rock backwards and is holding the rock at rest with a 83N force (note that the natural and stretched total band lengths are shown). The final time is defined immediately after the launch. Neglect loss.

that is probably false!

hi there!

out of the two, (b) precision would be more reasonable.   however, both a and b could be pretty reasonable.

-awesomerepublic   : )

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