Question 161: Centre of Mass and Rotational Motion

Question

A man (mass = 50 kg) and his son (mass = 20 kg) are standing on a frictionless surface facing each other. The
man pushes his son so that he starts moving at a speed of 0.70 ms–1 with respect to the man. The speed of the
man with respect to the surface is :

Accepted Answer

50 V
1
= 20 V
2
V
1
+ V
2
= 0.70
V
1
= 0.20

Answer

0.28 ms–1

Answer

0.47 ms–1

Answer

0.20 ms–1

Answer

0.14 ms–1

Centre of Mass and Rotational Motion

A man (mass = 50 kg) and his son (mass = 20 kg) are standing on a frictionless surface facing each other. The man pushes his son so that he starts moving at a speed of 0.70 ms–1 with respect to the man. The speed of the man with respect to the surface is :

Choose the correct answer: