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May 22, 2015

Homework Help: Physics

Posted by Dreskillz89 on Sunday, September 20, 2009 at 3:59pm.

A small 7.10kg rocket burns fuel that exerts a time-varying upward force on the rocket. This force obeys the equation F = A + Bt^2. Measurements show that at t = 0, the force is 121.0N, and at the end of the first 2.10s , it is 176.0N.

Part A
Find the net force on this rocket the instant after the fuel ignites.
Part B
Find the acceleration of this rocket the instant after the fuel ignites.
Part C
Find the net force on this rocket 4.10s after fuel ignition.
Part D
Find the acceleration of this rocket 4.10s after fuel ignition.

I found out that
A = 121.0 N
B = 12.5 N/s^2
Net Force = 51.42 N
Acceleration = 7.24 m/s^2
Part C and Part D is what I am having trouble with.

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