Question

15. Assertion: The sum of the
momenta of two objects before the
collision is equal to the sum of
momenta after the collision. Reason:
There should be an external
unbalanced force acting on the
objects. *
a) Both A and Rare true and R is the
correct explanation of assertion.
O
b) Both A and R are true but R is not the
correct explanation of assertion.
c) A is true but R is false.
d) A is false but R is true.​

Answer 1

Answer:

b is the answer

hope it will help you

Answer 2

Answer : b) Both A and R are true but R is not the  correct explanation of assertion.

Explanation:

• The law of conservation of momentum states that the sum of momenta of two objects before collision is equal to the sum of momenta after the collision provided that system must be isolated means no external unbalanced force acts on them.
• Conservation of momentum is derived from Newton's laws of motion. Newton's third law states that every action has an equal but opposite reaction; the force that one object A exerts on object B is equal but opposite to the force that object B exerts on object A.
• Forces that cause a change in the motion of an object are unbalanced forces. Unbalanced forces are not equal and opposite

• Unbalanced force acting on an object results in the object's motion changing. The object may change its speed (speed up or slow down), or it may change its direction.

Hence, Assertion is true and Reason is true but Reason is not correct explanation of Assertion.