7. A horizontal spring with spring constant 85 N/m extends outward from a wall just above floor level. A 7.5 kg box sliding across a frictionless floor hits the end of the spring and compresses it 3.5 cm before the spring expands and shoots the boxback out. How fast was the box going when it hit the spring? How fast was the box going when it hit the spring? 8. A 64 kg sprinter, starting from rest, runs 45 m in 7.0 s at constant acceleration. What is the magnitude of the horizontal force acting on the sprinter? What is the sprinter's power output at 2.0 s, 4.0 s, and 6.0 s?
7. A horizontal spring with spring constant 85 N/m extends outward from a wall just above floor level. A 7.5 kg box sliding across a frictionless floor hits the end of the spring and compresses it 3.5 cm before the spring expands and shoots the boxback out. How fast was the box going when it hit the spring? How fast was the box going when it hit the spring? 8. A 64 kg sprinter, starting from rest, runs 45 m in 7.0 s at constant acceleration. What is the magnitude of the horizontal force acting on the sprinter? What is the sprinter's power output at 2.0 s, 4.0 s, and 6.0 s?
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Transcribed Image Text:7. A horizontal spring with spring constant 85 N/m extends outward from a wall just above
floor level. A 7.5 kg box sliding across a frictionless floor hits the end of the spring and
compresses it 3.5 cm before the spring expands and shoots the boxback out. How fast was
the box going when it hit the spring? How fast was the box going when it hit the spring?
8. A 64 kg sprinter, starting from rest, runs 45 m in 7.0 s at constant acceleration. What is the
magnitude of the horizontal force acting on the sprinter? What is the sprinter's power output at
2.0 s, 4.0 s, and 6.0 s?
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