kinematics equation problem

raincheck

"An experimental rocket sled can be accelerated at a constant rate from rest to 1600 km/hr in 1.8 s. What is the magnitude of the required net force if the sled has a mass of 500 kg?"

I know I have to use
[sum of the] F = ma

and i was trying
= 500 x 1600,
but I'm sure there's something else I have to do to get the right answer, since this isn't working..

OlderDan

Look again at the definition of acceleration. You have used velocity in place of acceleration. Be careful with your units. km/hr is not m/s.

QuantumCrash

If you are having trouble, try solving it in terms of kinematics first. After you find the acceleration, then you can do what you did.

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raincheck	kinematics equation problem Tweet "An experimental rocket sled can be accelerated at a constant rate from rest to 1600 km/hr in 1.8 s. What is the magnitude of the required net force if the sled has a mass of 500 kg?" I know I have to use [sum of the] F = ma and i was trying = 500 x 1600, but I'm sure there's something else I have to do to get the right answer, since this isn't working..

OlderDan Recognitions: Homework Help Science Advisor	Look again at the definition of acceleration. You have used velocity in place of acceleration. Be careful with your units. km/hr is not m/s.

QuantumCrash	If you are having trouble, try solving it in terms of kinematics first. After you find the acceleration, then you can do what you did.