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7. Ball X of mass 1.0 kg and ball Y of mass 0.5kg travel toward each other on a horizontal surface. Both balls travel with a constant speed of 5 m/s until they collide. During the collision, ball Y exerts an average force with a magnitude of 40N for 1/6s on ball X . Which of the following best predicts ball momentum after the collision?

A Ball Y will travel at a speed less than 5 m/s in the same direction of travel as before the collision.

B Ball Y will travel at a speed less than 5 m/s in the opposite direction of travel as before the collision.

C Ball will travel at a speed greater than 5 m/s in the same direction of travel as before the collision.

D Ball Y motion cannot be predicted because the impulse on it is not known.

The answer is C but I do not understand why. Please refrain from using any Calculus

Expert Solution

since mass of x is greater than mass of y

thus we have , vxf= uxi

vyf=2uxi -uyi

if uyi =0

than , vyf=2uxi

solved

genius_generous answered 2 years ago

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