IF hand written please be near and show formuals. Thank you for your help. 33. A

Question

IF hand written please be near and show formuals. Thank you for your help.

33. An ideal horizontal spring with spring constant 800 N/m is initially compressed 0.2 m. One end is attached to a wall and the other end touches a 4 kg block (not attached). The system is released from rest and the block slides 0.8 m from the release point before coming to rest. The horizontal surface below has a uniform roughness. What can we conclude about the coefficient of kinetic friction between the surface and the block? a) it may be 0.4 b) it must be 0.4 c) it must be 0.5 it may be 0.6 e) none of the above answers is correct 0.8 m

Explanation / Answer

By Conservation of energy

(1/2)Kx2 =umgd

(1/2)*800*0.22 =u*4*9.8*0.8

u=16/31.36

u=0.51 =0.5 (approx)

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