Physics help on potential and kinetic energy!

Posted on 2014-11-19 05:37:00 in Physics by BABLI

1)
A 7.2 kg block is dropped onto a spring of
spring constant 2357 N/m from a height of
700 cm.
Find the speed of the block when the com-
pression of the spring is 20 cm. The acceleration of gravity is 9.81 m/s2 .
Answer in units of m/s
2a)
The Royal Gorge bridge over the Arkansas
River is 366 m above the river. A bungee
jumper of mass 108 kg has an elastic cord of length 92 m attached to her feet. Assume the cord acts like a spring of force constant k. The jumper leaps, barely touches the water, and after numerous ups and downs comes to rest
at a height h above the water.
The acceleration of gravity is 9.81 m/s2 .
Find h.
Answer in units of m
2b)
Find the maximum speed of the jumper.
Answer in units of m/s

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