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72.
REASONING
The magnitudes of the initial (
v
0
= 0 m/s) and final (
v
= 805 m/s)
velocities are known.
In addition, data is given for the mass and the thrust, so that
Newton’s second law can be used to determine the acceleration of the probe.
Therefore, kinematics Equation 2.4 (
v
=
v
0
+
at
) can be used to determine the time
t
.
SOLUTION
Solving Equation 2.4 for the time gives
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This note was uploaded on 01/29/2010 for the course CALC 01:640:135 taught by Professor Soffer during the Spring '08 term at Rutgers.
 Spring '08
 SOFFER

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