A freight train has a mass of 4.5*10^7 kg

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To determine the time required for a freight train with a mass of 4.5 x 10^7 kg to accelerate from rest to 85 km/h under a constant pull of 15 x 10^5 N, one must first calculate the acceleration using Newton's second law, F=ma. The force exerted by the locomotive results in an acceleration of approximately 0.0333 m/s². Next, converting the final velocity from km/h to m/s gives 23.61 m/s. Using the kinematic equation that relates acceleration, initial velocity, final velocity, and time, the time can be calculated as approximately 708 seconds. Proper unit conversion and application of both Newton's laws and kinematics are essential for solving this problem.
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A freight train has a mass of 4.5*10^7 kg. If the locomotive can exert a constant pull of 15*10^5 N, how long would it take to increase the speed of the train from rest to 85 km/h?

I know u need to use F=ma but how do i find time
 
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Think! What are you trying to find by using F=ma? Clue: You do need to use a little kinematics in this qn. If u have acceleration, final velocity and initial velocity, how are you goin to find time?
 
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Also remember to use the correct units, i.e. don't use km/hr.
 

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