At a baseball game, Bill observes from the bleachers Jack throwing a ball toward home at 15 km/s while Kevin runs toward home from third base at 7 km/s. What is the velocity of the ball from Bill's and Jack's perspectives?

bill:15 km/s; jack 15 km/s

Explanation:

bill and jack are the same because both are standing still.

answer is c

explanation:

c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

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