Aspring is stretched to a displacement of 3.4 m from equilibrium. then the spring is released and allowed to recoil to a displacement of 1.9 m from equilibrium. the spring constant is 11 n/m. what best describes the work involved as the spring recoils?

87 j of work is performed on the spring.

44 j of work is performed on the spring.

the spring performs 87 j of work

the spring performs 44 j of work.

iron would move it is magnetic there is a mag field around the current in the wire

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

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