A system of four masses is composed into a square with equal sides of length 1.20 m. The lower left mass, m1 =  3.3 kg, is placed at the origin.  The upper left mass m2 =2.0 kg is placed along the y-axis.  The upper right mass, m3 = 5.7 kg and the final mass, along the y-axis is m4 = 1.5 kg.  

What is the x coordinate (in m) of the centre of mass? Answer

What is the y coordinate (in m) of the centre of mass? Answer

 

2) 

A particle of mass m₁ = 240 g undergoes a head-on, elastic collision with a particle of mass m₂moving with the same speed from the opposite direction. After the collision particle m₁ comes to rest. Find the mass, m₂, of the other particle.

Select one:

a. None of the other answers are correct

b. 0.240 kg

c. 0.120 kg

d. 0.080 kg

e. 0.040 kg