I have a lab that involves Newton's law. Basically, one person has to sit on a moving cart and we are required to find the weight of the person and the cart together experimentally. We cannot weight them. However, we have a rope, a spring scale, a timer and tape measure. I am not sure exactly how to proceed. We can use newton's second law (F= ma) to find the acceleration and we can also use the kinematic equations. Can you please help me with the procedure? What steps should I do?