A 48.6 kg ice skater is moving at 2.61 m/s when she grabs the loose end of a rope, the opposite end of which is tied to a pole. She then
moves in a circle of radius 0.718 m around the
pole.
Find the force exerted by the rope on her
arms. The acceleration of gravity is 9.8 m/s
2
.
Answer in units of kN.

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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