- #1
Motorboar
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Homework Statement
A series of weights connected by very light cords are given an upward acceleration of 4.00 m/s2 by a pull P, as shown in Fig. 5.3.( a verticle strand of 4 balls with mass 5,10,15,and 20 kg with the pull at the top) A, B, and C are the tensions in the connecting cords.
the pull P is closest to:
290 N
690 N
50 N
200 N
490 N
Homework Equations
F= ma
The Attempt at a Solution
treating the weights as one mass
Pull-mg=ma
pull=m(a+g)
= 552
Which is not one of the answers. What is the error in my logic?