L4_phys131_26sep07

# L4_phys131_26sep07 - A rocket is launched vertically upward...

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A rocket is launched vertically upward, accelerating constantly for 16 seconds, and then the rocket engine is turned off. After 20 seconds, the rocket is 5100 meters above the ground. What is the rocket’s acceleration during the first 16 seconds? The setup and answer are given below, but you have to fill in the details. (3 unknowns, so 3 equations) ( 29 ( 29 2 01 2 1 2 1 2 1 1 2 01 2 1 01 1 01 1 01 1 s m 27 a t t g 2 1 t t v x x a 128 t a 2 1 x a 16 t a v = - - - = - = = = = t 2 =20s, x 2 =5100m, v 2 =? t 1 =16s, x 1 =?, v 1 =? t 0 =0s, x 0 =0m, v 0 =0m/s a 01 a 12

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