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Find the swimmer's speed at the bottom of the slide if she starts with an initial speed of 0.840m/s. the vertical height of the slide is 2.61m - No friction!

2006-12-06 12:06:48 · 2 answers · asked by Anonymous in Science & Mathematics Physics

2 answers

Matthew N's solution ignores the initial speed, u=0.840m/s. You have to consider all the initial energy.
mgh + 1/2mu^2 = 1/2mv^2

2006-12-06 12:35:59 · answer #1 · answered by sojsail 7 · 0 0

you could use the conservation of energy method, or the kinematics method, but i will show you the conservation of energy method because i am not very sure about the kinematics method.

taking g=10 (but if you use 9.81, please redo the calculations)

gravitational potential energy = mgh
kinetic energy = 1/2mv^2

so,

mgh=1/2mv^2, assuming no energy is lost due to resistance or friction

pluck in the values:

m x 10 x 2.61 = 1/2 x m x v^2

both masses would cancel, so the value of m does not matter.

so you calculate it out yourself

2006-12-06 20:14:44 · answer #2 · answered by Matthew N 5 · 0 0

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