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F=ma problem, I feel retarded because I can't get it

  • Thread starter phx1
  • Start date
  • #1
phx1
Seriously I feel so stupid because I can't get the answer to the second part of the problem, what am I doing wrong?

Homework Statement



2 parts to the problem:

An empty truck whose mass is 1500 kg has a maximum acceleration of 1.4 m/s^2 . What is the maximum force that accelerates the truck? ______N

What is the maximum acceleration when it is carrying a 500 kg load? (hint: same force, but new total mass) ______m/s^2

Homework Equations



F=ma

The Attempt at a Solution



This is for a web based quiz and I got the first part right, it's obviously 2100 N, so then I figured: ok, so to find the acceleration using the same force just solve for a, therefore it should be 2100 N/500 kg, which gives me an answer of 4.2 m/s^2. It's telling me the 2100 N is correct, but not the 4.2 m/s^2 ... what am I doing wrong or not taking into consideration? It's so easy I'm just missing it...
 

Answers and Replies

  • #2
277
1
Force = TOTALmass * acceleration

What is the TOTALmass
 

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