If two objects of equal masses 'm' are moving towards each other with the same speeds 'v' then what will be the total final momentum after elastic head-on collision?
Correct answer: D. 0 kg m/s
- A. mv kg m/s
- B. - mv kg's
- C. 2 mv kg's
- D. 0 kg m/s
Explanation
According to the law of conservation of momentum, total initial momentum of a closed system is equal to total final momentum of a closed system. Since two equal masses are moving in opposite direction, computing vector sum of total initial momentum gives us zero:m * (+v) + m * (-v) = 0Therefore, total final momentum is also equal to 0
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About Force and Motion
Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
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