Calculating Net Force for a Viper Accelerating at 45 km/hr in 2 seconds

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Homework Help Overview

The problem involves calculating the net force acting on a car (Viper) that accelerates from rest to a velocity of 45 km/hr over a period of 2 seconds, assuming constant acceleration. The mass of the car is given as approximately 800 kg.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss finding acceleration using kinematic equations and applying Newton's second law to determine net force. Questions arise about the correct kinematic equation and the interpretation of acceleration.

Discussion Status

The discussion includes attempts to clarify the correct approach to calculating acceleration and net force. Some participants have provided guidance on using the change in velocity over time to find acceleration, while others express uncertainty about their calculations.

Contextual Notes

There is a mention of an assumption regarding the car's initial velocity being 0 m/s, which is not explicitly stated in the problem. Participants are also navigating between kinematic and dynamic equations in their reasoning.

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Homework Statement


Dough boy took a ride in his new car, he hammers the throttle in 2 seconds and his velocity is 45 km/hr (assume constant acceleration). The mass of the Viper is approximately 800kg, Find the net force acting on the viper.

To be honest I am clueless on this question, I have done it myself and gotten the wrong answers. The answer to the net force is 5000N as stated in the answers part but I am not sure how to get that. Would appreciate any help.
 
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First, find the acceleration using a kinematics equation, and then use Newton's second law to find the net force.
 
Hi there can you please provide the kinematic equation? Is it a=v/t ? If so I got 22.5 m/s2 which I suspect is wrong...
 
Acceleration is not v/t. Remember that acceleration is a change in velocity, so you can't just write v/t because you've got all sorts of values you could plug in for velocity. You're half right though. Try the change in velocity over the time, or Δv/t.

Also, it's not stated in this problem, but I think you should assume the car's initial velocity is 0 m/s.
 
Okay I just got the answer, thanks for reminding me of the kinematic equations. I was focused on solving this with only dynamic equations.
 

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