Solve Physics HW: Find Net Force at t=2.00s

[scirfy]

Homework Statement

A 3.00kg object is moving in a plane, with its x and y coordinates given by x=5(t^2)-1 and y = 3(t^3) + 2, where x and y are in meters and t is in seconds. Find the magnitude of the net force acting on this object at t=2.00s

Homework Equations

F=ma

The Attempt at a Solution

i know i need to find the 2nd derivatives of the functions but i don't know if I am doing that right. i got 10 and 18t? I am not sure what to do with them though.

 

[tiny-tim]

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hi scirfy! welcome to pf!

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A 3.00kg object is moving in a plane, with its x and y coordinates given by x=5(t^2)-1 and y = 3(t^3) + 2, where x and y are in meters and t is in seconds. Find the magnitude of the net force acting on this object at t=2.00s
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i know i need to find the 2nd derivatives of the functions but i don't know if I am doing that right. i got 10 and 18t? I am not sure what to do with them though.

that's correct, the acceleration is (10, 18t) at time t

now you need to find the acceleration at t = 2.00, and then use F = ma to find the force