A vertical spring (ignore its mass), whose spring constant is 1070 N/m, is attached to a table and is compressed 0.100 m. (a) What speed can it give to a 0.400 kg ball when released?

I just need the answer for Part A, PLEASE HURRY BECAUSE I HAVE SO MUCH OTHER HW TO DO

I can not solve the problem if I do not have the mass.

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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