Question

5. Assertion (A) : A man standing on a completely frictionless surface can propel himself by whistling.
Reason (R) : If no external force acts on a system, its momentum cannot change.
(1) Both A and R are true and R is the correct explanation of A
(2) Both A and R are true and R is the correct explanation of A
(3) A is true but R is false
(4) A is false but R is true

Answer 1

1 is the answer
hope this helps

Answer 2

Both A and R are true but R is not a correct explanation of A