Question

please solve it my brother/sister q 12&13​

Answer 1

Answer:

12) According to law of conservation of momentum

Explanation:

Mass of bullet × velocity of bullet=mass of gun× recoil velocity of gun

0.02×200=7.5×recoil of gun

Recoil of gun=0.02×200/7.5=0.53m/s

Hope this help your brother

13) When the fireman holds the hose, it has an opposite reaction according to the third law of motion...Thus, due to the opposite reaction of the reaction of the water with high velocity a fireman finds it difficult to hold the hose.(Third law of motion)