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I found the mass to be 1.53e3 kg then I figured now I need to find the acceleration using the information that I have so I used the equation

Vf^2 = Vi^2 + 2a(Xf-Xi)

Vi = 12.5 m/s

Vf = 0 m/s

Xf = 12m

Xi= 0 m

Then plug the acceleration value into the equation F= ma but apparently that's wrong. Is this the correct method?