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I understand b) now thanks :D but a) I am still having trouble understand how it is solved

thank you for your help td21 :)

ok

Is there any other way this problem can be solved?

Homework Statement A child is pulling a wagon of mass 7.38 kg up a hill inclined at an angle of 14.3° to the horizontal. The child applies a force parallel to the hill. The acceleration of the wagon is 6.45 cm/s2 up the hill. Friction is negligible. Determine the magnitude of (a) the force...