|Nov9-06, 11:44 PM||#1|
kinematics equation problem
"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..
|Nov10-06, 12:21 AM||#2|
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.
|Nov10-06, 12:36 AM||#3|
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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