Question

Q.21
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 with respect to the man. The speed
of the man with respect to the surface is :
[JEE Main-2019 (April)]
(1) 0.20 ms
(2)0.14 ms'
(3)0.47 ms
(4) 0.28 ms
1
Please give this answer

Answer 1

Answer:

Ans is 2

Explanation:

0.14m/s

Answer 2

Answer

⇒0=50V

1

−20V

2

and V

1

+V

2

=0.7

⇒V

1

=0.2