Part A Block A in the figure (Figure 1) has mass 1.00 kg, and block B has mass 3

Question

Part A Block A in the figure (Figure 1) has mass 1.00 kg, and block B has mass 3.00 kg. The blocks are forced together, compressing a spring S between them; then the system is released from rest on a level, frictionless surface. The spring, which has ne fastened to either block and drops to the surface after it has expanded. Block B acquires a speed of 1.10 m/s What is the final speed of block A? gligible mass, is not m/s Submit My Answers Give Up Part B How much potential energy was stored in the compressed spring? Figure 1 of 1 Submit My Answers Give Up m, = 1 .00 kg m 3.00 kg

Explanation / Answer

Applying momentum conservation,

initial = final momentum

0 = (3 x 1.10) - (1 x vA)

vA = 3.30 m/s .......Ans(A)

(B) Applying energy conservation,

U = mA vA^2 /2 + mB vB^2 /2

U = (1 x 3.30^2 / 2 )+ (3 x 1.10^2 / 2 )
  
U = 7.26 J

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