Time to Accelerate from 30.0 m/s to 50.0 m/s - 5s

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SUMMARY

The discussion focuses on calculating the time required for an object to accelerate from 30.0 m/s south to 50.0 m/s north with a constant acceleration of 4.0 m/s². The correct approach involves recognizing that the change in velocity is the difference between the final and initial velocities, taking into account their directional nature. The formula used is time = (vf - vi) / acceleration, resulting in a calculated time of 5 seconds for the acceleration to occur.

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Homework Statement


How long will it take a mass to accelerate from 30.0m/s (south) to 50.0m/s(north) if its acceleration isa sonstant 4.0m/s2(north)


Homework Equations


displacement=V/Time
Aav=V/time

The Attempt at a Solution


a=4.0ms2
v=20ms
d=Vav*time
time=v/acceleration
20ms/4.0ms2
=time is 5s
 
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No, you have the correct equation, but your change in velocity is incorrect. At the beginning, the mass is moving 30 m/s south and we want it to accelerate and reach 50m/s north. Remember that velocity is a vector.
 
i think u can use this simple formula whcih is
time= change in velocity (vf-vi)/ acceleration
and remember south and north are oppostite directions *hint*
 
Last edited:

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