A fastball collides with identical ball at rest in an elastichead on collision.

Question

A fastball collides with identical ball at rest in an elastichead on collision. Which is correct after collision with respect tothe fast ball? a. maintains same velocity b. maintains 1/2 initial velocity c. stops d. moves in opposite direction I believe it is D? Want to make sure! Thanks! A fastball collides with identical ball at rest in an elastichead on collision. Which is correct after collision with respect tothe fast ball? a. maintains same velocity b. maintains 1/2 initial velocity c. stops d. moves in opposite direction I believe it is D? Want to make sure! Thanks!

Explanation / Answer

Apply the law of conservation of momentum we have as, m1u1+m2u2=m1v1+m2v2 m*v+m*0=m*v1+m*v2 v=v1+v2 v1=v-v2 This is positive so it moves in the same direction with1/2initial velocity as. Hence we get by it.

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