Two block are connected by a lightweight, flexible cord that passes over friction less pulley. If m1=3.6 kg amd m2= 9.2kg, and block 2 is initially at rest 140 cm. above the floor, how long does it take block 2 to reach the floor?

Answer 1

net force pulling: g(m2-m1)
F=total mass*a
a= g(m2-m1)/(m2+m1)

d=1/2 a t^2 solve for t.