Determine Mass from Net Force, distance, and velocity

[Kupopopo]

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

 

[jedishrfu]

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.

 

[tal444]

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.