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Two blocks with masses 0.443 kg (A) and 0.769 kg (B) sit on a frictionless surface....

Two blocks with masses 0.443 kg (A) and 0.769 kg (B) sit on a frictionless surface. Between them is a spring with spring constant 26 N/m, which is not attached to either block The two blocks are pushed together, compressing the spring by 0.338 meter, after which the system is released from rest. What is the final speed of the block A? (Hint: you will need to use both conservation of energy and conservation of momentum to solve this problem).

2. As a rough model of the impact of walking, consider that half of the mass of the entire body strikes the ground with a downward velocity of 0.693 m/s and comes to a full vertical stop over an impact duration of 23.3 ms. Calculate the magnitude of the force in kN associated with this single step for a person with a mass of 78.9 kg.

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