5. A 60 kg circus performer is swinging from a trapeze bar. A: She is 10 m off the ground with a speed v1. The spring-board platform below her is at its equilibrium length. B: She lets go of the trapeze bar and lands on th spring-board platform, which compresses when she lands on it. When she is stationary, she is 2 m off the ground and the spring is maximally compressed. C: The spring-board extends and launches her back into the air. As soon as the spring is totally relaxed again, the performer is 3 m off the ground and has a speed v2. D: The performer lands on a platform 10 m above the floor, and she stands stationary. a. Her initial speed v1 = 10 m/s. What is her total energy at point A? b. Between points A and B, assume none of her energy is lost to heat or friction. When she is stationary on the compressed platform at B, how much energy is stored in the spring-board platform? c. When the spring-board platform is fully released at point C, what must her speed v2 be
5. A 60 kg circus performer is swinging from a trapeze bar.
A: She is 10 m off the ground with a speed v1. The spring-board platform below her is at
its equilibrium length.
B: She lets go of the trapeze bar and lands on th spring-board platform, which compresses
when she lands on it. When she is stationary, she is 2 m off the ground and the spring
is maximally compressed.
C: The spring-board extends and launches her back into the air. As soon as the spring is
totally relaxed again, the performer is 3 m off the ground and has a speed v2.
D: The performer lands on a platform 10 m above the floor, and she stands stationary.
a. Her initial speed v1 = 10 m/s. What is her total energy at point A?
b. Between points A and B, assume none of her energy is lost to heat or friction. When
she is stationary on the compressed platform at B, how much energy is stored in the
spring-board platform?
c. When the spring-board platform is fully released at point C, what must her speed v2 be?
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