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an apple in a tree without climbing the tree.

Sitting in a chair connected to a rope that

passes over a frictionless pulley, Chris pulls

on the loose end of the rope with such a force

that the spring scale reads 272.5 N. Chris’s

true weight is 464 N, and the chair weighs

67 N.

The acceleration of gravity is g = 9.8 m/s2 .

A. Find the magnitude of the acceleration of

the system.

Answer in units of m/s2.

B.

Find the magnitude of the force Chris exerts

on the chair.

Answer in units of N.

i got the acelleration and it was marked correct (0.258380414312617702)

but when i look for the force which i used f=ma.... it was marked wrong... i tried first in N than in kg and still nothing...