Question
11. How high should an object go so that its potential energy gain is the same as its kinetic energy when it was moving at 20 m/s?
12. A 2000 kg carriage moves with an initial velocity of 25.0 m/s on horizontal road slides to a stop at a distance of 60.0 M. (a) Find the work done by the kinetic friction force in the carriage. (b) Determine the kinetic friction coefficient between the wheels and the road. Ans: (a) W =-625 KJ (b) Μ k = 0.53
Ejercicios de Práctica n X ualcampuspupt edu/t ualcampus pupr edu/bbcswebdax/pid-728896-dt content-rid-6864044 1/courve/WI-18-SCIE1430 22 11. ¿A qué altura debe llegar un objeto para que su ga tila en csegi. potencial sea l. mima-su energia cinética cuando se estaba moviendo a 20 m/s? Am: se mueve con-velocidad tuial de 25 О ms on caneerlinantl i, dalia distancia de 60.0m ()Halle el trabajo efectuado por la fuerza de frieción 12. Un carro de 2000 kg hasta detenerse en ua cinética en el earro. (b) Determine el coeficiente de frieeidn cinética entre las ruedas y la carretera. A 13. Ua bloque de 3.0 kg es liberado deade reposo a tana altura de 5.0m una raspe libre de friccide. Al final de la rampa se eneuentra un resorte de ooatante 400 Nim. El bloque se desliza por la rampa y comprine el resorte en una distancia r antes de momentincamente cntrar en reposo. Halle la distancia 14. Un bloque de 0.30 kg se mueve cos una velocidad inicial de 1.2 m/s y se dirige bacia una base qoe e unida a un resorte de contante k 50 N comprime el resorte? Aas: 15cm La aperficie es libee de finccibe 2Qve dstancis el bloque IS. Una particula de masa 1.00 kg e libera desde el pueto A y se deslizs una la pista libee de friscide que se muestra en la figura Halle la rapider de la particuls en los punton ByC-5 6 7 8
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Answer #1

Here we use concept of energy conservation and work energy theorem.

mgh 2 2- hV ory 29 12) a 1 2 Mv -625 D00J O.53

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