Determine Mass from Net Force, distance, and velocity

AI Thread Summary
A dynamics cart is pulled by a net force of 1.2M, moving 6.6m and reaching a velocity of 3.2m/s. The equation F=ma is used to determine mass, with the initial velocity assumed to be zero. The user initially calculated the mass as 5kg but the textbook states it should be 1.5kg. The correct approach involves using the equation V(final)^2 = V(initial)^2 + 2*a*d to find acceleration. Properly substituting the values should yield the textbook's answer of 1.5kg.
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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