Asked by A

A small 6.90-kg rocket burns fuel that exerts a time-varying upward force on the rocket. This force obeys the equation F=A+Bt2. Measurements show that at t=0, the force is 119.0 N , and at the end of the first 2.40 s , it is 193.0 N .

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 3.90s after fuel ignition.
Part D
Find the acceleration of this rocket 3.90s after fuel ignition.

I found out that
A = 119.0 N
B = 12.8 N/s^2
Net Force = 51.4 N
Acceleration = 7.45 m/s^2
Part C and Part D is what I am having trouble with.
Answered by Anaonymous
same problem cant solve part C and D
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