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Expert: Alon Mandes - 11/22/2010


Question
The position function, s(t)=-16t^2+240t+150, is of an object
thrown upward from the top of a 150 foot building.  When will
it strike the ground?  What will the velocity be when it
strikes the ground?

Answer
To know When will it strike the ground, we must solve s(t)=0 .
The 2 solutions are : t1=-0.6 AND t2=15.6 . Thus , it will hit
the ground at time t=15.6 sec
The velocity is the derivative of the position , hence
s'(t)=-32t+240 .
s'(15.6)=-32*15.6+240=-259.2 ft/sec . The "-" sign indicates
that the velocity is in the oposite direction from the direction
the ball was thrown !

Alon.

Calculus

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Alon Mandes

Expertise

Kind of questions I can answer : Limits, Derivatives, Integration, Implicit functions, continuousity, differentiation ,Extremum problems, Lagrange multipliers, Gradients, Surface integrals, Multi variables functions ,Multi variables Integrals,Complex variables ,Complex functions, Curves, Trajectory integrals & Vector analyse,Divergence,Rotor & word problems. Kind of question I can't answer : Economics,Combinatorics,infinite series & convergence ,Statistics & Probabilities .

Experience

1. I'm a team member of mathnerds (math site for answering questions) 2. I'm a team member in the Student's Union of the Technion, helping students who have problems in mathematics. 3. 2 years of experience as a math teacher in college. 4. I give free homework help for high school students in Mathematics & Physics. 5. I teach part time in collage the subjects : "Digital Signal Processing" , "Random Signals & Noise" , "Complex Functions".

Organizations
Hi-Tech company : GSM4VOIP ; job possition : Algorythm developer.

Education/Credentials
M.A in Mathematics & Bs.c in Electronics.

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