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Un cohete de prueba se dispara verticalmente hacia arriba desde un pozo. Una catapulta le da una rapidez inicial de 80.0 m/s a nivel del

Un cohete de prueba se dispara verticalmente hacia arriba desde un pozo. Una catapulta le da una rapidez inicial de 80.0 m/s a nivel del suelo. Despus se encienden sus motores y acelera hacia arriba a 4.00 m/s2 hasta que llega a una altitud de 1 000 m. En este punto sus motores fallan y el cohete entra en cada libre, con una aceleracin de-9.80 m/s2.

a) Para qu intervalo de tiempo el cohete est en movimiento sobre el suelo?

b) Cul es su altitud mxima?

c) Cul es su velocidad justo antes de chocar con la Tierra? (Necesitara considerar el

movimiento mientras el motor funciona separado del movimiento en cada libre.)

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