A boy and a girl are on an ice rink. The boy is at rest at the beggining. The gi

Question

A boy and a girl are on an ice rink. The boy is at rest at the beggining. The girl has a determined velocity, hits the boy and they move joined after the impact. If the girl has more mass than the boy and there is no friction. What statement is false?

a)In the impact, the lineal momentum stays the same.

b) In the impact the the boy and girl lose kinetic energy.

c)Initial kinetic energy is the same as the final kinetic energy of both

d)Final velocity of both after the impact is less than the initial velocity of the girl

e)During the collision a force is produced on the girl and a force is produced on the boy that are on opposite directions

Explanation / Answer

This is the case of inelastic collision.

In inelastic collision, the conservation of momentum holds true, but not conservation of kinetic energy. This implies that In the impact, the lineal momentum stays the same and In such a collision, kinetic energy is lost by bonding the two bodies together.

In this case, the initial kinetic energy is not equal to final kinetic energy. Therefore, the option ( c) is flase

After collision, the velocity of object is less than before collision and the both objects experience force inaccordance with Newton's third law.

Answer: Option (c) is flase

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