Three Blocks,light Connecting Ropes,and a Light Frictionless Pulley Comprise a System,as

Three blocks,light connecting ropes,and a light frictionless pulley comprise a system,as shown in the figure.An external force of magnitude P is exerted downward on block A,causing block A to accelerate downward at a constant 2.5 m/s².The rope connecting block B and block C exerts a 60-N force.
(a)What is the magnitude of the force P?
(b)What is the mass of block C?

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