Thanks guys
this is the other sullution i got:
F = ma
a = F/m
call the object of mass 15kg object 1
call the object of mass m kg object 2
acceleration of system (object 1 + object 2) = acceleration of object 1 = acceleration of object 2 = 150N / (15kg + m kg)
acceleration of object 2 = 80N / m...
I don't know how to put it.
I can work out the force of the string and the accel but i can't do it the other way around
i have taken the answer and tried to work backwards and see if i get 80N force on the sting between the block
For block m (17,1 kg's)
Fr = ma
F2 = 17,1a...
http://img75.imageshack.us/img75/9735/prob1ve7.jpg
Frictionless surface, pulled along a horizontal line, string has no mass
Calculate the mass m
The answer says 17,1 kg, i don't know if it is correct,
can sum1 please give a solution with the steps:smile: