A model rocket, initially on the ground, is fired vertically upward from rest. I

Question

A model rocket, initially on the ground, is fired vertically upward from rest. Its acceleration for the first four seconds is a(t) = 48t at which time the fuel is exhausted and it becomes a "free falling" body (that is to say, a(t) = -g). Twenty seconds later, the rockets parachute opens and the downward velocity slows linarly to -32 ft/sec in 8 seconds; the rocket then floats to the ground at that rate. Get the acceleration function for each stage I, II, III, IV. and fill in all the times, velocities, and altitudes.

Explanation / Answer

1. Present worth of machine B = $22750

2. Present worth of machine A is approximately = $7700

3. Machine B should be selected

1. Alternative X is good

2. Y & Z

3. V,Z,X,Y

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