Determine Mass from Net Force, distance, and velocity

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SUMMARY

The discussion focuses on calculating mass from net force, distance, and velocity using the dynamics formula. A net force of 1.2M [Forward] is applied to a cart that moves 6.6m, reaching a velocity of 3.2m/s [Forward]. The correct mass, as per the textbook, is determined to be 1.5kg, contrasting with an initial incorrect calculation of 5kg. The key equation used is V(final)^2 = V(initial)^2 + 2*a*d, where the initial velocity (V(initial)) is assumed to be 0.

PREREQUISITES
  • Understanding of Newton's Second Law (F=ma)
  • Familiarity with kinematic equations, specifically V(final)^2 = V(initial)^2 + 2*a*d
  • Basic algebra for solving equations
  • Concept of net force and its application in dynamics
NEXT STEPS
  • Review the derivation and application of Newton's Second Law (F=ma)
  • Study kinematic equations in detail, focusing on their use in solving motion problems
  • Practice problems involving net force, mass, and acceleration calculations
  • Explore common mistakes in dynamics problems and how to avoid them
USEFUL FOR

Students studying physics, particularly those focusing on dynamics and motion problems, as well as educators looking for examples of common calculation errors in force and mass problems.

Kupopopo
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First time in these forums so nice to meet everyone

Homework Statement



A dynamics cart is pulled from rest by a net force of 1.2M [Forward]. The cart moves 6.6m, reaching a velocity of 3.2m/s [Forward].


Homework Equations



F=ma


The Attempt at a Solution



I tried using the formula V(final)^2 = V(initial)^2 + 2*a*d to get acceleration and plug it into F=ma to find mass and got 5kg but the textbook says that the answer is 1.5kg
 
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I assume vi = 0 in your calculation so that vf^2 = 2 . a . d with d=6.6m

what did you get for a?

given a you should get what your book says.
 
Possibly you made an error in your calculations. As jedishrfu said, if you plug in all the known values in, you should get 1.5kg no problem.
 

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