please help don\'t know how to solve these 3 questions 4. Under what condition i

Question

please help don't know how to solve these 3 questions

4. Under what condition is the total momentum in collision conserved? a) If collision is elastic d) Always b) if collision is inelastic e) never c) if collision is perfectly inelastic 5. How much does the momentum of a ball of velocity 3 m/s change upon collision with a wall and acquiring a velocity of 5 m/s in opposite direction? a) 0 kg m/s b) 2 kg m/s c) 8 kg m/s d) Not enough info given e)none of these 6. What is the recoil momentum of a gun firing a 20 g bullet at 500 m/s? a) 0 kgm/s b) 3 kgm/s c) 5 kgm/s d) 8 kgm/s e) not enough info given 7. A 1-kg chuck of putty is thrown with a velocity of 5 m/s at a 10kg bowling ball, initially at rest. What is the momentum of the system right after the collision? b) 10 kg m/s a) 5 kgm/s c) 15 kg m/s d) 2 kgm/s e) none of these

Explanation / Answer

4. (d) Always

Unless and external force acts in the system , total linear momentum of system will be conserved.

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