Explain at what time does the rocket begin to descend

Reference no: EM13203653

A rocket is launched with an intial velocity of zero, and with acceleration in feet per second per second defined by a(t)= 20e^(-t/2) for 0<t<10 and -16 for t>10 sec
a. at what time does the rocket begin to descend?

Reference no: EM13203653

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