lPal length. The block on the inclined plane is drawn back 20.0 cm along its sur

Question

lPal length. The block on the inclined plane is drawn back 20.0 cm along its surface, causing the hanging block to rise to 40.0cm off the ground, and released from rest. How fast is the hanging block moving when the spring reassumes its natural length? 13. Katya is training for an upcoming gymnstics competition and needs to improve her upper body strength. At the moment, she can only support at most 180% of her body weight. Misha, ac that she train on a swinging trapeze. Katya grabs onto t he trapeze 60.0° with the vertical. She steps off the platform and swings forward. To what height will she fall/rise as she swings? Will Katya swing back to the platform? Support your answer.

Explanation / Answer

assume the ground level to be the point where the cable reaches when it is vertical.

initial height of Katya=l-l*cos(theta)=0.5*l

let the final height she rises to h .

balancing energy before the jump and energy after she reaches maximum height:

mass*g*0.5*l=mass*g*height

so she will rise to a height of 0.5*l

assuming there is no friction and air drag, there will be no energy loss. hence she can swing back to the platform.

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