e preMous 11 o43 next Exercise 7.21 Enhanced - with Solution Part A low far must

Question

e preMous 11 o43 next Exercise 7.21 Enhanced - with Solution Part A low far must the spring be compressod for an amount 3.50 J of potental energy to be stored in it? Express your answer using two significant figures You may want to revicw 212 212 or relatd prob cmsl ing tips and stratgis, you may want to vicw a Vidco Tuter 4 102 m Correct IDENTIFY: The east potent al arergy ot the sprng ls proportionzl to the square ot compesalon length SET UP EXECUTE: U-z2 sor-v.ar' _ Part B d-0.1247 01247 Submit Incorrect; Try Again; 2 attempts remaining Con nue

Explanation / Answer

(A) U = k x^2 / 2

3.50 = 1700 x^2 /2

x = 6.4 x 10^-2 m

(b) suppose maximum compression is d and at maximum compression , it will be at rest.

now applying work - energy theorem,

work done by spring + work done by gravity = change in KE

- 1700 d^2 / 2 + (1.20 x 9.8 x (d + 0.900)) = 0 - 0

850 d^2 - 11.76d - 10.58 = 0

d = 0.12 m

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