Posted by **myra** on Wednesday, May 9, 2012 at 8:20pm.

A 32.0 kg child descends a slide 4.00 m high. She reaches the bottom with a speed of 2.40 m/s, was the mechanical energy conserved? Explain your reasoning and identify the energy transformations involved.

- physics.... -
**Elena**, Thursday, May 10, 2012 at 11:20am
ΔPE =m•g•Δh-0 = 32•9.8•4 =1254 J,

ΔKE =0 - m•v²/2 = - 32•(2.4)²/2 = -92.15J.

If the energy is conserved, ΔPE = - ΔKE.

They are not equal; therefore, the part of energy was lost, most likely, for friction.

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